> For the complete documentation index, see [llms.txt](https://docs.langstack.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.langstack.com/welcome/in-depth-learning/connectors.md).

# Connectors

## What are connectors?

In Langstack, data connectors are used to establish a connection to a data source to integrate with databases, protocols, and web services. An ETL pipeline uses Connectors to exchange data between a data source and a destination. 

The Connector templates help users create applications that provide the means to reach a data source. 

## List of tools supported by Langstack connectors

Langstack supports connectors that can be used to establish a connection with the following tools: 

* Microsoft SQL Server (MS-SQL)
* SFTP/FTP
* MySQL
* PostgreSQL
* CouchDb
* REST APIs (GET and POST)
* Google Sheets