Most people have a retractable keyboard tray that slides in and out from under the desktop. A keyboard tray is generally a flat platform that rides on a set of wheels and rollers.

Keyboard trays are great, but when you find out about the keyboard arm you will probably want to do an upgrade.

A keyboard arm is much more than just a tray. The keyboard arm actually tilts and swivels which allows you to set it perfectly for your own comfort and ease of use.