What is a CRC sequence used for?

What is a CRC sequence used for?

• To provide redundancy
• To carry address information
• To detect errors in digital networks
• To pass a key encryption method 

EXPLANATION

A cyclic redundancy check 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.