What is CRC or Cyclic redundancy check? All Questions › Category: Networks › What is CRC or Cyclic redundancy check? 0 Vote Up Vote Down chetan shidling asked 5 years ago I need short information. 1 Answers 0 Vote Up Vote Down chetan shidling answered 5 years ago A cyclic redundancy check (CRC) is an error detecting code commonly used in digital networks and storage devices. Basically used to detect accidental changes to raw data.