What is functional testing in mobile applications, and what areas should it cover?

When performing functional testing on a mobile application, what exactly needs to be validated?

I’d like to understand the key aspects like user interactions, app workflows, and business logic that should be tested to ensure the app behaves as expected across different devices and OS versions.

What are the essential areas to focus on during this type of testing?

In my mobile QA work, functional testing ensures that the app’s features behave as defined in the requirements.

I usually test critical user flows, like login, navigation, form submissions, push notifications, and error messages. I also validate edge cases, like what happens when the user is offline or when permissions are denied.

For me, it’s all about mimicking real user behavior as closely as possible.