We like to think of a web application as a more complex version of a website, offering users extensive functionality to manage content. Web applications can be accessed from a browser without the need to install any software. For example, our website allows you to view our content, but not much more. On the other hand, Facebook offers greater capabilities and control over the content its users can see and share.
If you're looking for a web application developer, we build them with a similar approach where users can actively deliver content themselves, while you can build on the website and add various features as and when you want to.