Least significant bit. The bit that has the least value in a binary number or data byte. In written form, this would be the bit on the right.

For example: Binary 1101 = Decimal 13

In this example the right-most binary digit, 1, is the least significant bit, here representing 1. If the LSB in this example were corrupt, the decimal would not be 13 but 12. See also: MSB.