A web application is a software application that runs on a remote server and is viewable in a browser across a network such as the Internet. Web applications have inherent cross platform compatibility without the need to be installed on the client computer. The applications themselves are written using programming languages. Programmers can change a web application without the need to update it on the client’s side.

Common applications include Facebook, Flickr, Twitter and a multitude of other websites. You could also consider AirBnB as a true example of what a web application is, although a very large one. The convenience of using a web browser without the need to update and maintain applications, distribute and install software on millions of computers is the key reason for its popularity.

Reference: Wikipedia



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