# HStream Connector Overview
Stream Database should work with other external systems like messaging systems and other database easily.
HStream Connector enable you to easily feed data from external systems into HStreamDB or feed data from HStreamDB into external systems.
HStream connectors should include two types of connectors: source and sink.
Source Connector - A source connector subscribes data from other systems like mysql or clickhouse, making the data availlable for hstream data processing.
Sink Connector - A sink connector write data to other systems like mysql or clickhouse. It often subscribes data from stream in HStreamDB.