Answer:
"OS" Stands for Operating System. And Operating system is considered one of the 3 types of software. An OS takes the "hardware" or computer parts inside your computer, and puts them to good Use. Without your OS, your Computer would be a Large Paper-weight. The OS is Virtual, it isn't something you can hold or see ( except on your screen of course (: ) . The OS is stored in the Hard drive inside your computer. Your hard drive also holds all your other files, like your programs, pictures, and music, etc.
Some Examples of Operating Systems:
-Windows
-Windows XP
-Windows Vista
-Windows 7
-Mac OS
- Tiger
- Leopard
- Snow Leopard
- Linux
- Ubuntu
- Debian
- Red Hat