# PC Building |  | A custom built or home-built computer is a computer assembled by its user and made of commercial off-the-shelf (COTS) components, rather than purchased as a complete and ready to use machine, also known as a "pre-built" or out-of-the-box system. | |-|-| | | wikipedia:: [Homebuilt computer](https://en.wikipedia.org/wiki/Homebuilt_computer) |