Angular is used in development of Single page applications(SPA). In a single page application, we are changing what the user views by showing and hiding sections of display which is responsible to particular components (rewriting the current web page with new data(code) from the server rather than getting a new HTML page requesting the server). In Angular SPA
index.html is the running page and inside display components are created and routed to use.
To handle navigation from one component to another component, we use the Angular