Co-Location also known as colo.

A server located at a dedicated facility designed with special resources, such as a secure cage, regulated power, a dedicated Internet connection, online security, and online technical support. Co-location facilities offer customers a secure place to physically house their hardware and equipment (as opposed to keeping it in their offices or warehouse, where the potential for fire, theft, or vandalism is much greater). Administration is done remotely so that a customer far away can configure and control their network equipment.

This term also refers to a "colo facility," a data center in an unserved or underserved market (also known as a "second-tier city"). Most co-location facilities offer high-security, including cameras, fire detection and extinguishing devices, multiple connection feeds, filtered power, backup power generators and other items to ensure high-availability which is mandatory for all Web-based, virtual businesses.

Co-location sites are being erected at various points around the world to provide services to the rapidly expanding Web hosting and e-commerce marketplace.