# Install a REST client

Since Celonis APIs are REST APIs, you will need a way to interact with them. There are multiple ways to do this, but to keep things simple, we will use Postman, which is a very popular and free REST client.

Note
If you already have a REST client, you can ignore this section.

If not, go to the [Postman Download page](https://www.postman.com/downloads/) and download the version for your Operating System. Once the client is
downloaded, install it on your computer.

Once installed, it should look like something like this:

![Sample screenshot showing the standard Postman login screen.](/assets/postman.fb7e39c0911cfc6226a27aeb1510092494b70f38ec367047218adb5a81f60521.1df0a4ac.png)

To start using Postman, create an account or click the "Skip and go to the app" link.