Before the introduction of Angular, web developers used VanillaJS and jQuery to develop dynamic websites. Later, when the websites became more complex with added features and functionality, it was hard for them to maintain the code. Along with this, there were no provisions for data handling facilities across the views by jQuery. The need for a client-side framework like Angular was obvious which can make life easier for the developers by handling separation of concerns and dividing code into smaller bits of information (components).
Client-side frameworks like Angular facilitate developers to develop advanced web applications like Single-Page-Application. These applications can also be developed using VanillaJS, but the development process becomes slower doing so.
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