Examples of Input Devices – 20+ Input Devices of Computer

An input device is a hardware component that sends data and instructions to a computer. It converts user actions into digital signals. The computer then processes these signals to perform specific tasks.

As a computer science educator, I have experience teaching hardware fundamentals. I have tested and explained hundreds of input devices. This guide covers 20+ examples of input devices categorized by type, and use case.

What Are 5 Examples of Input Devices?

The five most common examples of input devices are:

1. Keyboard – For typing text and commands
2. Mouse – For pointing and clicking on screen
3. Scanner – For converting physical documents into digital format
4. Microphone – For capturing audio input
5. Webcam – For capturing live video input

List of 20+ Input Devices of Computer

Here is a comprehensive list of input devices organized in a table. This format helps you find answers quickly.

Examples of Input Devices by Category

Input devices are classified based on how they send data to the computer. Understanding these categories helps you in exams, interviews, and practical computer usage.

1. Pointing Input Devices

Pointing devices control the position of the cursor on the screen. They are the most commonly used input devices in daily computing.

Mouse

A mouse is a handheld pointing input device. It controls the movement of the cursor on the display screen. When the user moves the mouse, optical or laser sensors detect the motion. The mouse then sends coordinate data to the computer.

A standard mouse has two buttons and a scroll wheel. The left button selects items. The right button opens context menus. The scroll wheel helps navigate through documents and web pages.

The first computer mouse was built in 1963 at Stanford Research Institute by Douglas Engelbart. It was made of wood and had only one button.

Trackball

A trackball is a pointing device with a ball on top. The user rotates the ball with fingers or palm to move the cursor. The ball stays in place while the device remains stationary.

Trackballs are common in industrial settings and CAD workstations. They save desk space and reduce wrist movement compared to a mouse.

Touchpad

A touchpad (or trackpad) is a flat surface that detects finger movement. It is built into most laptops. Sliding a finger across the surface moves the cursor. Tapping acts as a click. Modern touchpads support multi-touch gestures. These include pinch-to-zoom, two-finger scroll, and three-finger swipe.

Graphic Tablet (Digitizer)

A graphic tablet is an input device for digital drawing. It has a flat surface and a stylus. When the stylus touches the surface, the tablet detects pressure, tilt, and position data. Graphic tablets are essential tools for digital artists, designers, and illustrators. Brands like Wacom and Huion are industry leaders.

Light Pen

A light pen is a pen-shaped input device. It detects light emitted by a CRT or LCD screen. The user points the pen directly at screen elements to select, draw, or modify them. Light pens were widely used in the 1960s and 1970s. The first light pen was created in 1955 by Tom Dimond at MIT Lincoln Laboratory.

Joystick

A joystick is an input device mainly used for gaming. It has a stick that tilts in multiple directions. Moving the stick sends directional signals to the computer. Joysticks often include additional buttons and triggers.

Joysticks have been used since the early 1900s. They are common in flight simulators, arcade games, and industrial machinery control.

2. Keying Input Devices

Keying devices allow users to enter text, numbers, and commands through physical key presses.

Keyboard

A keyboard is the most common input device. It has keys for letters, numbers, symbols, and function commands. When a user presses a key, the keyboard sends a scancode to the computer. The operating system then processes this input and displays the correct character.

Most modern keyboards have between 84 and 110 keys. They connect via USB or wirelessly through Bluetooth. Some include multimedia keys, volume controls, and programmable shortcuts.

The first computer keyboard was derived from the typewriter. The QWERTY layout was designed in 1873 by Christopher Latham Sholes to reduce jamming in mechanical typewriters.

• MIDI Keyboard – A MIDI keyboard sends musical performance data to a computer. It does not produce sound on its own. Instead, it triggers software instruments through MIDI (Musical Instrument Digital Interface) protocol.MIDI keyboards are used by music producers, composers, and live performers.
• Numeric Keypad – A numeric keypad is a separate input device with number keys (0-9) and basic math operators. It is used for fast data entry in accounting, finance, and spreadsheet work.

Audio input devices capture sound and convert it into digital data.

3. Audio and Voice Input Devices

Microphone

A microphone is an audio input device. It captures sound waves and converts them into electrical signals. The computer’s sound card then digitizes these signals for processing.

Microphones are used for voice calls, audio recording, voice recognition, and podcasting. Types include built-in, USB, condenser, dynamic, and wireless microphones.

Alexander Graham Bell patented the first microphone (liquid transmitter) in 1876 as part of the telephone invention.

Voice Recognition System

Voice recognition (or speech recognition) is a technology that converts spoken words into text or commands. It uses a microphone as the input hardware and AI algorithms for processing. Modern voice input systems like Google Assistant, Siri, and Alexa can understand natural language. They perform tasks like web searches, setting reminders, and controlling smart home devices.

Voice input devices are especially important for accessibility. They allow users with physical disabilities to operate computers hands-free.

4. Video and Image Input Devices

These devices capture visual data and send it to the computer.

Webcam

A webcam is a small digital camera that connects to a computer. It captures live video and still images. The video can be transmitted over the internet for video calls, live streaming, and conferencing.

Most modern laptops have built-in webcams. External webcams offer higher resolution and better low-light performance.

One of the first webcams was set up at Cambridge University in 1991. It was used to monitor a coffee pot so researchers could check if coffee was available without leaving their desks.

Digital Camera

A digital camera captures photos and videos in digital format. It converts light into digital data using an image sensor (CCD or CMOS). Users transfer these files to a computer for editing, storage, or sharing.

Digital cameras range from smartphone cameras to professional DSLR and mirrorless systems. The first consumer digital camera was the Dycam Model 1, released in 1990 with a resolution of 376×240 pixels.

Scanner

A scanner is an image input device that converts physical documents, photos, or objects into digital images. It uses a light source and sensors to capture the content.

Types of scanners include:

• Flatbed scanner – Most common type for documents and photos
• Sheet-fed scanner – Pulls documents through a roller system
• Handheld scanner – Portable device dragged across the surface
• 3D scanner – Captures three-dimensional objects

Scanners are widely used in offices, libraries, and publishing. They work with OCR software to convert scanned text into editable documents.

5. Source Data Automation Input Devices

These devices read data directly from source documents without manual keying. They reduce errors and speed up data entry.

Barcode Scanner

A barcode scanner reads black-and-white bar patterns printed on products. It uses a laser or LED light source to detect the code. The scanner then decodes the data and sends it to the computer.

Barcode scanners are essential in retail stores, warehouses, libraries, and logistics. They enable fast checkout, inventory tracking, and shipment processing.

QR Code Scanner

A QR (Quick Response) code scanner reads square-shaped codes that store URLs, text, contact details, or payment information. Modern smartphones have built-in QR scanners using their cameras.

QR codes were invented in 1994 by Denso Wave, a Japanese company. They were originally designed for tracking automotive parts.

OCR (Optical Character Recognition)

OCR is a technology that reads printed or handwritten text from documents and converts it into editable digital text. It uses a scanner as the input hardware and pattern recognition software for processing.

OCR is used in digitizing books, processing forms, extracting data from receipts, and converting PDFs to Word documents.

MICR (Magnetic Ink Character Recognition)

MICR reads characters printed with special magnetic ink. It is primarily used in the banking industry to process cheques. The magnetic ink allows machines to read cheques even if they are overwritten or stamped.

6. Biometric Input Devices

Biometric devices use unique biological traits for identification and authentication.

• Fingerprint Scanner – A fingerprint scanner reads the unique ridge patterns on a human fingertip. It is the most widely used biometric input device. It is found on smartphones, laptops, door locks, and time-attendance systems.
• Retina Scanner – A retina scanner maps the unique blood vessel pattern at the back of the eye. It provides a very high level of security. Retina scanners are used in high-security facilities like military installations and research labs.
• Facial Recognition Camera – A facial recognition camera captures a person’s face and matches it against a database. It uses AI and machine learning to identify individuals. It is used in smartphone unlocking, airport security, and surveillance systems.
• Iris Scanner – An iris scanner captures the unique patterns in the colored ring of the eye. It is more accurate than facial recognition and less intrusive than retina scanning. It is used in border control and high-security access systems.

7. Modern and AI-Powered Input Devices (2026)

• Eye-Tracking Device – An eye tracker monitors where a user is looking on the screen. It uses infrared cameras to track eye movement and pupil position. This technology is used in accessibility tools, UX research, and gaming.
• Gesture Recognition Sensor – Gesture recognition devices interpret hand and body movements as computer commands. They use cameras and depth sensors (like Intel RealSense) to detect gestures in 3D space.
• Brain-Computer Interface (BCI) – A BCI reads brain signals and converts them into computer commands. While still in early stages, devices like Neuralink are pushing this technology forward. BCIs have significant potential for accessibility and medical applications.
• Haptic Input Device – Haptic devices provide tactile feedback during input. They allow users to “feel” virtual objects. Advanced haptic gloves are used in VR training, remote surgery, and design.
• AI Voice Input with Context Awareness – Modern voice input systems in 2026 use large language models for context-aware dictation. They understand tone, intent, and context better than earlier systems. They can format documents, write code, and execute complex multi-step commands through voice alone.

What Is the Most Commonly Used Input Device?

The keyboard is the most commonly used input device in computers. It is essential for typing, programming, data entry, and navigation. Almost every desktop and laptop computer comes with a keyboard.

The mouse is the second most commonly used input device. Together, the keyboard and mouse form the standard input combination for personal computers. For mobile devices, the touch screen is the most common input method. It combines pointing and tapping into a single interface.

Frequently Asked Questions (FAQs)