In context of error detection and correction in computer networks, CRC stands for:

A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents.

Example

Polynomial is:  x⁵ + x⁴ + x² +1

A polynomial higher degree is 5, so append 5 0’s to the message bits.

Message: 1010001101 00000

Divisor polynomial in bits = 110101