What is Angular JS used for
Its source code is freely available to read, understand, use and extend.
Which means the visual side of the website. i.e, when a user visits a website; what he/she sees at the front or what is visible to the user, at first sight, is called the front end of the website. It is used to enhance the functionality of the visual side of the website easily.
Generally, it is a collection of prebuilt resources working together to perform a specific task.