High Quality Content by WIKIPEDIA articles! A plug computer is a small form factor server for use in the home or office. Compared to their PC-based counterparts, plug computers are lower cost, consume less power, often do not have a video card, and are intended to be powered up at all times. Although plug computers are often enclosed in an AC power plug or AC adapter, the term "plug" also refers to "plug and play" appliance-like devices which may be in any form factor.