What is the function of the 'userdel' command in system administration?

The 'userdel' command serves a crucial role in system administration by allowing administrators to delete user accounts from the system. When executed, it removes the specified user's account and can also optionally remove the user's home directory and mail spool, depending on the options provided with the command. This is an essential function for managing user access, ensuring that former users do not retain privileges or access to system resources. Proper use of 'userdel' contributes to maintaining system security and managing user permissions effectively.