Matrix is a federated chat protocol. It is like IRC or XMPP but synchronizes history and uses HTTP-based protocol. There are bridges to IRC, XMPP, and Gitter.

Matrix is a federated chat protocol. It is like IRC or XMPP but synchronizes history and uses HTTP-based protocol. There are bridges to IRC, XMPP, and Gitter. Riot is a client. It used to be named Vector.im.