A *bit* is the basic unit of information in [[Classical Information|classical information]]. They build the basis of modern data processing. All everyday information from cat videos on the internet to nuclear launch codes is electronically stored in the form of classical bits. A bit can have two values, $0$ or $1$. ![[bits.excalidraw.light.svg]]In practice, bits can be represented in a multitude of ways. They can be realized by the number ($0$ and $1$), by black and white cards or by magnetic domains on a hard drive. Thus, there is a distinction between the theoretical concept of a bit and its practical implementation. The difference between implementation and concept reappears with [[Qubit]] and [[Platforms|platforms]] for quantum technologies. >[!ref]- References