Binary Digits - Computer Data
Computers represent data using binary digits, called bits. A bit is either a zero or a one. Bits are used for computer data because they are easy to represent electronically. A switch can be either closed switch represents one. Or the orientation of a magnetic field can represent a bit; magnetism in one direction represents a zero, manetism in the opposite direction represents a one. Or, for optical media, small pits are burned onto the surfact of the disk so that they will frlect light. Ina given spot, a relection means a one; no reflections means a zero.