Lotus Domino is an IBM server product that provides enterprise-grade e-mail, collaboration capabilities, and custom application platform. Domino began life as Lotus Notes Server, the server component of Lotus Development Corporation's client-server messaging technology. It can be used as an application server for Lotus Notes applications and/or as a web server. It also has a built-in database system in the format of NSF. From release 7, Domino server can use DB2 system as its backend database.