toetsbord

Toetsbord, often written toetsenbord, is the input device used to enter text and commands on computers and other electronic devices. It consists of a rectangular array of keys that, when pressed, produce characters or perform functions such as copying or deleting. Most contemporary keyboards connect via USB; wireless variants use Bluetooth or other protocols. In many languages the layout adapts to the local alphabet.

Keyboard layouts vary; the most common in many countries is QWERTY. Other widely used layouts include AZERTY (Franco­phone) and QWERTZ (German-speaking). Laptop keyboards and desktop keyboards may have similar layouts but differ in size. Key types include standard alphanumeric keys, punctuation, and control keys (Ctrl, Alt, Shift). Many keyboards also include function keys, media controls, and programmable macro keys. Some models feature backlighting, ergonomic designs, or split layouts to reduce strain.

There are two major classes for the key switches in mechanical keyboards: mechanical switches and membrane switches. Mechanical switches provide tactile feedback and durability; membrane keyboards are quieter and cheaper. Key rollover and anti-ghosting describe how many simultaneous key presses can be recognized.

Historically, keyboards evolved from typewriter key formats to computer input devices. The IBM PC introduced the 101-key layout in the 1980s, establishing standard positions that persist in modern USB keyboards, though ISO and ANSI variants exist.

In practice, keyboards are used for typing, programming, gaming, and data entry, with numerous specialized models for ergonomics, portability, or high-speed input.