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# Packages Glossary

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By default, Phoenix applications depend on several packages with different purposes. This page is a quick reference of the different packages you may work with as a Phoenix developer.

The main packages are:

- Ecto - a language integrated query and database wrapper

- Phoenix - the Phoenix web framework (these docs)

- Phoenix LiveView - build rich, real-time user experiences with server-rendered HTML. The LiveView project also defines `Phoenix.Component` and the HEEx template engine, used for rendering HTML content in both regular and real-time applications

- Plug - specification and conveniences for building composable modules web applications. This is the package responsible for the connection abstraction and the regular request- response life-cycle

You will also work with the following:

- ExUnit - Elixir's built-in test framework

- Gettext - internationalization and localization through `gettext`

- Swoosh - a library for composing, delivering and testing emails, also used by `mix phx.gen.auth`

When peeking under the covers, you will find these libraries play an important role in Phoenix applications:

- Phoenix HTML - building blocks for working with HTML and forms safely

- Phoenix Ecto - plugs and protocol implementations for using phoenix with ecto

- Phoenix PubSub - a distributed pub/sub system with presence support

When it comes to instrumentation and monitoring, check out:

- Phoenix LiveDashboard - real-time performance monitoring and debugging tools for Phoenix developers

- Telemetry Metrics - common interface for defining metrics based on Telemetry events

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