COM Express® Module Base Specification Rev 3.1
A Computer-On-Module, or COM, is a Module with all components necessary for a bootable host computer, packaged as a super component. A COM requires a Carrier Board to bring out I/O and to power up. COMs are used to build computer solutions and offer OEMs fast time-to-market with reduced development costs. Like integrated circuits, they provide OEMs with significant freedom in meeting form-fit-function requirements. For all these reasons, the COM methodology has gained much popularity with OEMs in the embedded industry.