# Working with the supported foreign data wrappers for Amazon RDS for PostgreSQL
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A foreign data wrapper (FDW) is a specific type of extension that provides access to external data. For example, the `oracle_fdw` extension allows your RDS for PostgreSQL DB cluster to work with Oracle databases. As another example, by using the PostgreSQL native `postgres_fdw` extension you can access data stored in PostgreSQL DB instances external to your RDS for PostgreSQL DB instance.

Following, you can find information about several supported PostgreSQL foreign data wrappers. 

**Topics**
+ [Using the log\_fdw extension to access the DB log using SQL](CHAP_PostgreSQL.Extensions.log_fdw.md)
+ [Using the postgres\_fdw extension to access external data](postgresql-commondbatasks-fdw.md)
+ [Working with MySQL databases by using the mysql\_fdw extension](postgresql-mysql-fdw.md)
+ [Working with Oracle databases by using the oracle\_fdw extension](postgresql-oracle-fdw.md)
+ [Working with SQL Server databases by using the tds\_fdw extension](postgresql-tds-fdw.md)

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for Amazon RDS. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query AmazonRDS` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).