CRC (Cyclic Redundancy Check) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. By applying a polynomial division algorithm, a short, fixed-length binary sequence (the CRC value) is generated from a block of data. When data is transmitted or stored, this CRC value is recalculated and compared to the original. If the values differ, it indicates that the data may have been corrupted. CRCs are widely used for verifying data integrity in files, archives, network packets, and disk storage, but they are not designed for cryptographic security or protection against intentional tampering.