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Testing an app is the process of checking a software application to make sure it works correctly, is stable, and meets expected requirements. It involves running the app in different conditions to find errors, bugs, or performance issues before it is released to users.

Testers evaluate how the app behaves when users interact with it, including buttons, menus, forms, and features. They also check whether the app works properly on different devices, screen sizes, and operating systems.

Testing can include verifying functionality, checking speed and responsiveness, ensuring data is handled correctly, and confirming that the user experience is smooth and intuitive. The goal is to improve quality, reliability, and overall performance before the app becomes publicly available.