Stream depots
Stream depots contain streams, a type of branch that includes hierarchy and policy. Like local depots, stream depots reside on the Helix Server. If you are using the distributed versioning architecture (DVCS), the personal server uses a stream-type depot.
See also p4 stream in the Helix Core Command-Line (P4) Reference and the Streams chapter of Helix Core Command-Line (P4) Guide.