The primary purpose of error detection in communications is to identify and correct data transmission errors that may occur during the transfer of information. Error detection techniques, such as checksums and cyclic redundancy checks (CRC), monitor the integrity of data packets, ensuring accuracy and reliability. By promptly detecting errors, systems can initiate retransmission of the corrupted data, thereby maintaining the quality of communication. Effective error detection is crucial for ensuring the reliability of data exchange in various applications, including telecommunications and computer networks.