The Bower is a package management system for the client-side programming on the World Wide Web. It depends on Node.js and npm. It works with a git and GitHub repositories.
The many programming languages have standard package managers, which developers use to install all libraries: gem for Ruby, pip for Python and others. For the server-side JavaScript there is npm, but in client-side JavaScript until recently didn’t have anything. There were many different package managers (Jam, Volo, Component, Ender), but the majority of them never became popular, and there is a little sense in package managers that can’t install the right packages. The Bower is not the standard package manager for client-side JavaScript, but the most popular one: currently there are more than sixteen thousand packages.