What are the different types of automation testing tools?

Right, so there are quite a few types. People usually group them by what they're meant to do.

You have tools for functional testing. These check the user interface. They click buttons and fill in forms, you know? Selenium is a big one for this.

Then there are API testing tools. These test the 'back-end' bits without a screen. Postman is really popular for that.

Also, you've got performance testing tools. They see how your app handles lots of users at once. JMeter is a classic example.

Basically, some are free open-source tools, and others are paid commercial ones. It all depends on what you need to test.

Cheers.