What does operating system actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

Windows 7 is the latest operating system to reach “end-of-life,” or EOL, and become officially obsolete. This means no more updates, no more features, and no more security patches. Nothing.

The complete computer made up of the CPU, memory and related electronics (main cabinet), all the peripheral devices connected to it and its operating system. Computer systems fall into two ...