Utility program
File manager
Used to manage files on a disk such as delete, copy, move, rename and view files and performs tasks of formatting and copying disks, displaying a list of files on a storage medium, checking the amount of used or free space on a storage medium.
Diagnostic utility
Compiles technical information about a computer’s hardware and certain system software programs and then prepares a report outlining any identified problems.
Antivirus
Used to protect against viruses by deleting them.
Disk defragmenter
Stores data on a disk, it places the data in the first available sector on the disk.
Screen saver
Displays an animation or blank screen when you don't move the mouse or keyboard.