Apps are small programs that are usually installed on the smartphone or tablet. With a web app, installation is not necessary; instead, you use it via the Internet browser – for example, in Mozilla Firefox, Google Chrome or Safari.
This allows you to access programs such as messenger services or games, among others, if you don’t have your own smartphone or are not on your own device at the time. Sometimes not all the features that the app installed on a device has can be used in the web app. Not every app is also available as a web app, or some apps are only available as web apps.
By the way, so-called desktop apps work in a similar way. These small programs are placed on the desktop of your computer.