What are common terms for sections of a web application behind and not-behind login?

1. How does a web based application work?
2. Where does a web application reside?

How does a web based application work?

How Web applications work. Web applications do not need to be downloaded since they are accessed through a network. Users can access a Web application through a web browser such as Google Chrome, Mozilla Firefox or Safari. For a web app to operate, it needs a Web server, application server, and a database.

Where does a web application reside?

In contrast, Web applications reside on a server and users access the application over the Internet by means of a Web browser deployed on the mobile device.