Domino is the name of the applications and messaging server program for the Lotus Corporation‘s Lotus Notes product, a sophisticated groupware application that is installed in many corporations. Notes lets a corporation and its workers develop communications- anddatabase-oriented applications so that users at different geographic locations can share files with each other, comment on them publicly or privately (to groups with special access), keep track of development schedules, work projects, guidelines and procedures, plans, white papers, and many other documents, including multimedia files. Lotus uses the Domino name to refer to a set of Notes server applications. Notes itself refers to the overall product.
The Notes and Domino servers interact with other Notes/Domino servers in a distributednetwork. As changes are made to a database at one server, updates are continually forwarded to replicated copies of these databases at the other servers so that users are always looking at the same information. In general, Notes follows the client/server model. The replication updates are made using Remote Procedure Call (RPC) requests. Notes can be coordinated with Web servers and applications on a company’s intranet.
Reference : http://searchdomino.techtarget.com/definition/Domino