Web testing, or web application testing, is a software practice that ensures quality by testing that the functionality of a given web application is working as intended or as per the requirements. Web application testing allows you to find bugs at any given time, prior to a release, or on a day-to-day basis.
Mobile App Testing refers to the process of validating a mobile app (Android or iOS) for its functionality and usability before it is released publicly. Testing mobile apps help verify whether the app meets the expected technical and business requirements.