# Working with Trusted Language Extensions for PostgreSQL
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Trusted Language Extensions for PostgreSQL is an open source development kit for building PostgreSQL extensions. It allows you to build high performance PostgreSQL extensions and safely run them on your Aurora PostgreSQL DB cluster. By using Trusted Language Extensions (TLE) for PostgreSQL, you can create PostgreSQL extensions that follow the documented approach for extending PostgreSQL functionality. For more information, see [Packaging Related Objects into an Extension](https://www.postgresql.org/docs/current/extend-extensions.html) in the PostgreSQL documentation. 

One key benefit of TLE is that you can use it in environments that don't provide access to the file system underlying the PostgreSQL instance. Previously, installing a new extension required access to the file system. TLE removes this constraint. It provides a development environment for creating new extensions for any PostgreSQL database, including those running on your Aurora PostgreSQL DB clusters.

TLE is designed to prevent access to unsafe resources for the extensions that you create using TLE. Its runtime environment limits the impact of any extension defect to a single database connection. TLE also gives database administrators fine-grained control over who can install extensions, and it provides a permissions model for running them.

TLE is supported on Aurora PostgreSQL version 14.5 and higher versions.

The Trusted Language Extensions development environment and runtime are packaged as the `pg_tle` PostgreSQL extension, version 1.0.1. It supports creating extensions in JavaScript, Perl, Tcl, PL/pgSQL, and SQL. You install the `pg_tle` extension in your Aurora PostgreSQL DB cluster in the same way that you install other PostgreSQL extensions. After the `pg_tle` is set up, developers can use it to create new PostgreSQL extensions, known as *TLE extensions*.

 

In the following topics, you can find information about how to set up Trusted Language Extensions and how to get started creating your own TLE extensions.

**Topics**
+ [Terminology](PostgreSQL_trusted_language_extension-terminology.md)
+ [Requirements for using Trusted Language Extensions for PostgreSQL](PostgreSQL_trusted_language_extension-requirements.md)
+ [Setting up Trusted Language Extensions in your Aurora PostgreSQL DB cluster](PostgreSQL_trusted_language_extension-setting-up.md)
+ [Overview of Trusted Language Extensions for PostgreSQL](PostgreSQL_trusted_language_extension.overview.md)
+ [Creating TLE extensions for Aurora PostgreSQL](PostgreSQL_trusted_language_extension-creating-TLE-extensions.md)
+ [Dropping your TLE extensions from a database](PostgreSQL_trusted_language_extension-creating-TLE-extensions.dropping-TLEs.md)
+ [Uninstalling Trusted Language Extensions for PostgreSQL](PostgreSQL_trusted_language_extension-uninstalling-pg_tle-devkit.md)
+ [Using PostgreSQL hooks with your TLE extensions](PostgreSQL_trusted_language_extension.overview.tles-and-hooks.md)
+ [Function reference for Trusted Language Extensions for PostgreSQL](PostgreSQL_trusted_language_extension-functions-reference.md)
+ [Hooks reference for Trusted Language Extensions for PostgreSQL](PostgreSQL_trusted_language_extension-hooks-reference.md)