Final answer:
Testing an app involves running it with different combinations of data to ensure it operates correctly and is free of defects, making it a critical step in software development.
Step-by-step explanation:
When you test an app, you run it to make sure that it works properly no matter what combinations of valid or invalid data you enter. This process is known as testing and can include multiple stages, such as unit testing, integration testing, system testing, and acceptance testing. Each stage evaluates different aspects of the software to ensure robustness and that it is free of errors. Testing an application with various inputs helps to uncover any defects that could cause the app to behave in an unexpected way, which is crucial for providing a good user experience and maintaining software quality.
In the context of software development, when you test an app, you run it to ensure that it functions correctly regardless of the input data you provide. This process is known as testing and is intended to identify any bugs or errors that may exist in the app. By inputting various combinations of valid and invalid data, you can assess the app's performance and identify any issues that need to be addressed.