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Definition of Bit

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Definition: A Bit is a digit in the binary number system. It can have two values, 0 or 1. In computer RAM and ROM memory, a bit is a small electrical switch which is either on (value 1) or off (value 0).

However bits don't exist individually but in groups of 8 and that is a byte. So one Kilobyte of RAM = 1024 bytes or 8192 bits.

All CPUs have instructions to manipulate bits, such as rotating or shifting bits left or right in RAM or in a Register.

4610 = 001011102. If this is shifted left one bit (with a 0 bit put into the rightmost bit) the value is 010111002 which is 9210. A left shift of one bit is the same as multiplying by 2. A right shift is the same as deviding by 2.

Glossary:

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