This document discusses Sprockets, a Ruby library that concatenates JavaScript files for development and optimizes them into a single file for deployment. It addresses the problem of long load times from many separate JavaScript files. Sprockets turns code modules into a single file with dependencies managed through requires. It reduces file size by 34% and HTTP requests by 25% compared to non-optimized code. The document provides instructions on installing Sprockets via Ruby Gems and using it through the terminal or as a Rails plugin.