Web sites are made of lots of things — frameworks, libraries, assets, and utilities. Bower manages all these things for you.
Keeping track of all these packages and making sure they are up to date (or set to the specific versions you need) is tricky. Bower to the rescue!
To get started, Bower works by fetching and installing packages from all over, taking care of hunting, finding, downloading, and saving the stuff you’re looking for. Bower keeps track of these packages in a manifest file,
bower.json. How you use packages is up to you. Bower provides hooks to facilitate using packages in your tools and workflows.
Bower is optimized for the front-end. If multiple packages depend on a package – jQuery for example – Bower will download jQuery just once. This is known as a flat dependency graph and it helps reduce page load.