A server log is a file that records events and activities on a computer server. It captures information such as user access, errors, and system performance, helping administrators monitor and troubleshoot issues. Each entry typically includes a timestamp, the type of event, and relevant details. These logs are essential for maintaining the security and efficiency of a server. By analyzing the data in a server log, administrators can identify unauthorized access attempts, track usage patterns, and optimize server performance. Regularly reviewing these logs is a best practice for effective server management.