# About ingestion interfaces
Ingest source data into Cognite Data Fusion (CDF) using the Cognite integration services together with business standard interfaces and protocols that utilize the vast ecosystem of existing ETL solutions. We currently support Azure Data Factory, Microsoft's cloud-based data intergration service.
# Cognite PostgreSQL gateway
PostgreSQL gateway is a service that provides a PostgreSQL interface to CDF. Use this to integrate source data that can be accessed through ETL tools that support writing to PostgreSQL, such as Azure Data Factory,
# OPC UA
Read time series, events, and asset information via the open OPC UA protocol. The Cognite OPC UA extractor copies the OPC UA node hierarchy to CDF, then streams data and events to time series in CDF.