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folders on your computer’s local disk, just like you store files and
folders in a filing cabinet.

Examples of OS for Computers:
MS-DOS, Microsoft Windows OS, Macintosh (Mac) OS, Linux OS,

Unix OS, Chromium OS, etc.

Examples of OS for Handheld Devices:
Symbian, Android, iOS, Window CE, etc.

NB: MS- DOS is a text-based operating system that stands for Microsoft Disk

Operating System. It was one of the earliest PC operating systems that
displayed boring lines of text on the screen instead of icons and pictures. You
performed tasks in MS-DOS by typing text commands.

Utility Software
Utility Software is system software designed to help analyze, configure,
optimize or maintain the computer. E.g. Antivirus Software, Backup Software,
Data Compression Software, etc.