"What is a keyboard?" - it sound that this question could have the easy answer "A keyboard gives you control over your computer!". That this answer is a simplification and we already can start with the point that a keyboard is maybe not a controlling device of your computer. Thus has the following wiki-article a different approach on this question. It contains a lot of fragments like a deep search in the dark world of the computer-circuits, a short overview about the history of keyboards - especial in the age of the personal computer, different types of keyboard usage, examples of curios keyboards, a critique of the current visions of input-culture and a description of a keyboard in the view of a computer.