FTP handles file transfer errors by making use of various error-checking mechanisms and protocols. One of the primary mechanisms used is the checksum, which ensures that the data being transferred is accurate and complete. Additionally, the FTP protocol has built-in error correction and detection capabilities, such as acknowledgments, retransmission of lost packets, and error recovery procedures. When a file transfer error occurs, FTP typically returns an error message to the user, which may include details about the nature of the error, such as whether it was caused by a malfunctioning server or client device, a network connectivity issue, or an incorrect file format. The user may then attempt to resolve the issue by repeating the file transfer process or by using alternative methods of file transfer.