A data center is a building that houses computer systems and related technologies in a centralized environment. Data centers usually contain backup power systems, redundant connections to the Internet and advanced security measures, all of which are designed to keep the computer systems functional and secure at all times.
Data centers typically house large numbers of specialized computers called servers, which are largely used to host web sites. Data centers consume large amounts of electricity to power both the computer systems they house as well as to power the cooling systems that keep the computers from overheating. Data centers may also employ several people who work to perform maintenance, repairs and installations on the computers and related equipment.