To add on, functional testing checks if a feature works in isolation from a user’s standpoint, which often involves real-world scenarios. It’s often about validating the software’s behavior from the outside-in.
For example, you might test if a login button triggers the correct action. On the other hand, integration testing is more about ensuring that separate systems or parts of the application, like a database or API, function together. It’s not just about each part working individually, but how they communicate and function as a whole.