What Is a Keyboard? Definition, Uses, Types & Functions

What is a keyboard infographic showing mechanical keyboard features, including input device functions, typing performance, customization options, and wired or wireless connectivity.

A computer keyboard is an input device used to enter letters, numbers, symbols, and commands into a computer. It consists of keys arranged in groups, including alphanumeric keys, function keys, navigation keys, and modifier keys. People use keyboards to type documents, enter data, navigate applications, write code, and play games.

Most computer keyboards use the QWERTY layout, although other layouts are available for different languages and typing preferences. Keyboards can connect to computers through USB cables, Bluetooth, or dedicated wireless receivers.

In this guide, you’ll learn what a keyboard is, what it does, how it works, its main keys and features, the different types available, and how to choose a suitable keyboard for your needs.

What Is a Keyboard?

A keyboard is a computer input device that allows users to enter text, numbers, symbols, and instructions by pressing keys. It is one of the most common ways to communicate with a computer and control software.

A standard keyboard contains letters, numbers, punctuation marks, and special keys that perform specific actions. Depending on its design, it may also include a numeric keypad, multimedia controls, programmable keys, and backlighting.

Keyboards are used with desktop computers, laptops, tablets, smart TVs, and other compatible devices. Some are physical devices, while virtual keyboards appear on a screen and accept input through touch or a pointing device.

What Is the Definition of a Keyboard?

The definition of a keyboard is a device containing a set of keys used to enter information and commands into an electronic device.

In computing, a keyboard is classified as an input device because it sends information to a computer rather than presenting processed information to the user.

What Is a Keyboard Used For?

A keyboard is primarily used to enter information and give commands to a computer. However, its functions extend beyond ordinary typing.

Common uses of a keyboard include:

  • Typing text: Writing documents, emails, messages, reports, and other content.
  • Entering numbers: Filling out forms, updating spreadsheets, and entering numerical data.
  • Navigating applications: Moving through documents, webpages, menus, and software.
  • Using shortcuts: Performing common tasks with combinations such as Ctrl+C, Ctrl+V, and Alt+Tab on Windows.
  • Programming: Writing code and entering commands in development tools and terminals.
  • Gaming: Controlling characters, movement, and in-game actions.
  • Data entry: Entering information into databases, business software, and online forms.
  • Accessibility: Using keyboard navigation and shortcuts as alternatives to mouse-based interaction.

The exact functions depend on the keyboard, operating system, and application. Some keyboards also provide dedicated media keys for adjusting volume, controlling playback, or managing other device functions.

For a more detailed explanation, read our guide to Uses of a Keyboard.

What Are the Main Keys on a Keyboard?

Most keyboards group their keys by purpose. The arrangement and the keys available vary by keyboard size and model.

  • Alphanumeric keys: The letters, numbers, and punctuation that form the main typing area.
  • Function keys: The F1 to F12 row, whose actions depend on the operating system and application.
  • Modifier keys: Keys such as Shift, Ctrl, Alt, the Windows key, and Fn that change how other keys behave.
  • Navigation and arrow keys: Keys that move the cursor or scroll through content.
  • Numeric keypad: A block of number keys on the right, often omitted on compact keyboards and laptops.
  • Special keys: Everyday keys such as Enter, Spacebar, Backspace, Tab, Esc, and Caps Lock.

For a closer look at each section, read our guide to the Parts of a Keyboard. For key names and symbols, see Laptop Keyboard Keys.

How Does a Keyboard Work?

A keyboard detects a key press and sends the corresponding input to a connected computer or device. Its internal controller processes the key event and transmits it through a wired or wireless connection. The operating system and active application then interpret the input as text or a command.

Different keyboards use different mechanisms, including mechanical switches and membrane contacts.

Learn more in our guide to How Does a Keyboard Work?.

Keyboard Layout and Size

Keyboard Layout

A keyboard layout describes how letters, numbers, symbols, and other keys are arranged. QWERTY is the most common layout on English-language keyboards, and other layouts include AZERTY, QWERTZ, and Dvorak.

The layout printed on the keys and the input layout selected on your computer can differ. Learn more in our Keyboard Layout guide.

Keyboard Size

Keyboard size describes how many dedicated keys a keyboard has and how much desk space it needs. Common formats include full-size, tenkeyless (TKL), 75%, 65%, and 60%. Exact layouts vary between manufacturers.

See our Keyboard Sizes guide to compare each format.

Keyboard Features and Functions

Keyboard features influence how a keyboard feels, connects to a computer, and performs different tasks.

Common features include:

  • Key layout: Determines the arrangement of letters, numbers, symbols, and control keys.
  • Switch mechanism: Affects key movement, feedback, sound, and responsiveness.
  • Connectivity: Includes USB, Bluetooth, or a dedicated wireless receiver.
  • Keyboard size: Determines the available keys and the amount of desk space required.
  • Ergonomic design: May use split layouts, curved shapes, or adjustable positioning.
  • Backlighting: Illuminates keys and can improve visibility in dim environments.
  • Multimedia controls: Provide shortcuts for functions such as volume and media playback.
  • Programmable keys: Allow supported commands or macros to be assigned to selected keys.
  • Build quality: Materials and construction influence durability and the overall typing experience.

Not every keyboard includes all these features. A basic office model may prioritize affordability and simplicity, while a mechanical or gaming keyboard may offer more customization.

The switch mechanism is especially important when comparing physical keyboards. Read our guide to Keyboard Switches Explained to understand how different switches affect typing feel and sound.

Different Types of Keyboards

Keyboards come in several designs, each suited to different users and tasks. Common examples include:

  • Mechanical keyboards: Use individual switches beneath their keys.

  • Membrane keyboards: Use pressure-sensitive layers to register key presses.

  • Wireless keyboards: Connect through Bluetooth or a wireless receiver.

  • Ergonomic keyboards: Use designs intended to support a more comfortable typing position.

  • Gaming keyboards: May include programmable controls and customizable lighting.

  • Virtual keyboards: Display keys on a screen for touch-based input.

The best option depends on your typing habits, budget, available space, and intended use. Explore our complete Types of Keyboards guide for a detailed comparison.

Advantages and Disadvantages of Keyboards

Keyboards make typing, data entry, and shortcut-based navigation efficient. They support many tasks, including office work, programming, and gaming.

However, some keyboards require a learning period, occupy desk space, produce noticeable noise, or become uncomfortable when used with poor posture.

The advantages and disadvantages depend on the keyboard design and the user’s needs. Read our full guide to the Advantages and Disadvantages of a Computer Keyboard for more details.

Keyboard vs. Mouse and Other Input Methods

A keyboard and mouse are both input devices, but they are designed for different kinds of interaction.

A keyboard is primarily used for entering text, numbers, symbols, and commands. A mouse is primarily used for pointing, clicking, selecting, and dragging items on the screen.

For example, a keyboard is usually more suitable for typing a document, while a mouse is convenient for selecting icons or moving objects in a graphical application. Keyboard shortcuts can also make many tasks faster by reducing the need to switch between input methods.

Other input devices include touchscreens, microphones, styluses, scanners, and game controllers. Each serves a different purpose, and many computers use several input devices together.

Interesting Facts About Keyboards

  • QWERTY takes its name from six letters: The name comes from Q, W, E, R, T, and Y in the top letter row.
  • Keyboard layouts vary: QWERTY, AZERTY, QWERTZ, and Dvorak are examples of different layouts.
  • Not all keyboards have a numeric keypad: Compact models often omit it to reduce their footprint.
  • Some keyboards support programmable keys: These can be assigned to shortcuts or macros using compatible software.
  • Mechanical switches come in different designs: Linear, tactile, and clicky switches offer different types of feedback.
  • Keyboards can be wired or wireless: Many models communicate through USB, Bluetooth, or dedicated wireless receivers.
  • Keyboard shortcuts can reduce mouse use: Many operating systems and applications provide keyboard combinations for common commands.

These features demonstrate how keyboards have developed from simple typing devices into versatile tools for modern computing.

Frequently Asked Questions

What Is a Keyboard in a Computer?

A computer keyboard is an input device used to enter letters, numbers, symbols, and commands into a computer. It contains keys that let users type text, enter data, and control software.

What Is a Keyboard? Short Answer

A keyboard is an input device that allows users to enter text, numbers, symbols, and commands into a computer by pressing keys.

What Is a Keyboard Used For?

A keyboard is used for typing documents, entering data, writing code, using keyboard shortcuts, navigating applications, and controlling games. It helps users communicate with and operate a computer.

What Is the Main Function of a Keyboard?

The main function of a keyboard is to enter information and commands into a computer or another compatible electronic device. It allows users to type text, input numbers, and perform actions using keys and shortcuts.

Is a Keyboard an Input or Output Device?

A keyboard is an input device because it sends information and commands to a computer. A monitor is an output device because it displays processed information on the screen.

How Does a Keyboard Work?

A keyboard works by detecting when a key is pressed and sending the corresponding input to a connected device. The operating system and active application interpret that input as text, a command, or another action.

Related Keyboard Guides