What is web application?
A web application or web app itself is an application software hosted and served from a remote server and can be run on browser. No matter which OS you are using but important factor is here Browser and server where web app is hosted. Not all websites are Web App. There are mainly two types of websites:
Dynamic websites are also known as a Web App. Any web app have two important parts:
In a nutshell your browsers (Chrome, Opera or Safari) provide a platform to run any web app. Facebook, Youtube and Twitter are some examples of web app. I hope your doubt is now clear.