what is the need of bootstrap?

Bootstrap has ended up being one of the trendiest front-end systems in the entire web design industry. Before it got to be open-source, Bootstrap was firstly distinguished as a Twitter Blueprint. Bootstrap is responsive, portable to begin with, winning, and front-end structure, which is produced alongside CSS, JavaScript, and HTML. There are predefined classes in bootstrap that can be used to construct up the front end of the pages, which perfect for most browsers and across devices, in a brief length of time which generally would be an exceptionally tedious errand.