Unlike the static content of a website, which is the same for all users, a web app is dynamic, changing the display based on user inputs or actions such as placing an order, logging in, downloading a document, making a payment, or filtering search results.
A mobile app is downloaded and installed onto a mobile device, designed either for a specific platform (Android, iOS), known as a “native app,” or cross-platform (works on multiple platforms). When a user downloads the app, it gains access to system resources and data on that device, making security an even higher concern.