CRC stands for Cyclic Redundancy Check, a method used to detect errors in digital data transmission. It works by generating a unique code, or checksum, for a block of data and comparing it to the checksum received at the receiving end. If the two codes do not match, it indicates that an error has occurred during transmission and the data needs to be resent. This process is commonly used in computer networks, communication systems, and storage devices to ensure the accuracy and integrity of data. In simpler terms, CRC acts as a digital safeguard, ensuring that the data we receive is the same as the data that was sent.