Whats the relation between COM and DCOM

DCOM is an extended to COM that allows network-based component interaction. Because COM only ability that processes can run on the same machine but in different address spaces, the DCOM extension allows across a network. DCOM components can helpfull on variety of platforms . we can also say that COM and DCOM is single technology that provides a many services for component interaction, some specific tasks are component integration on a single platform,compo
nent interaction across heterogeneous networks.COM and its DCOM extensions are merged into a single runtime.