A data center is a facility which accommodates a lot of web servers. The machines can be used for numerous purposes - Internet hosting, file and photo storage, computing, etc. All bigger companies that offer online services have their web servers in one or numerous data centers because such a facility can supply the required conditions and security for the data kept on the hosting servers. This includes environmental settings for the humidity and temperature in order to ensure the maximum performance and long life of the web servers, backup generators, hardware monitoring and last, but not least, physical security as to ensure that that your data can't be accessed by an unauthorized third-party. A inadequately performing data center could easily undermine the services which a company offers.