# What is a module?

## Frontend Modules (End Users)

Modules extend IDEA experience by adding new functionalities for the end users.

{% hint style="info" %}
All frontend modules are optionals and IDEA administrators can decide whether or not they want to install them individually.
{% endhint %}

* [Virtual Desktop Interface (VDI)](https://docs.ide-on-aws.com/virtual-desktop-interface/)
* [HPC WorkLoads](https://docs.ide-on-aws.com/hpc-simulations/)

## Backend Modules (Cluster Admins)

Backend modules are mandatory and automatically installed during your initial IDEA deployment. Users do not directly interact with them.

* [Cluster Manager](https://docs.ide-on-aws.com/cluster-manager/)
* Directory Services
* Global Settings
* ...


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