What is Angular 7?
"Angular is a complete rewrite of AngularJS by the same team that built AngularJS."
What is Single Page Application (SPA)?
A single page application is a web application or a website which provides users a very fluid, reactive and fast experience similar to a desktop application. It contains menu, buttons and blocks on a single page and when a user clicks on any of them; it dynamically rewrites the current page rather than loading entire new pages from a server. That's the reason behind its reactive fast speed.
Difference between AngularJS and Angular
Angular 7 vs Angular6 vs Angular2 vs Angular1
Angular2 was a complete rewrite of Angular1. It was initially released in 2016. There is nothing common between Angular2 and Angular1 except the core developer's team. Angular2, Angular 6 and Angular 7 are very similar to each other. Angular 7 is the latest version. It contains the extensive features of Angular2 and Angular6. These versions are known as Angular.