| Term | Description |
| Kernel | The kernel is the main part or core of an operating system. It handles the most basic and important chores such as starting programs and managing files, memory and system resources. |
| Key | A key could refer to any one of the number, letter or symbol characters on your keyboard. It could also refer to a code used to unlock an encoded file or message. A key is sometimes supplied with a computer that locks out keyboard access. Also, in the system Registry in Win9x, the different sections are called Keys. |
| Keyboard | The most important input device. Keyboards are used to type commands, data, and other information into your computers memory for processing. |
| Kilobyte | A kilobyte (K or Kb) is equal to 1024 bytes. 1024 Kilobytes is equal to 1Megabyte. |