RubyGems.org is a central repository for Ruby programming language libraries, known as "gems." It allows developers to easily share and manage their code, making it simpler to incorporate third-party libraries into their projects. Each gem can contain code, documentation, and dependencies, streamlining the development process. Developers can search for, install, and update gems using the RubyGems package manager. This platform supports a vibrant community, enabling collaboration and innovation within the Ruby ecosystem. By providing a standardized way to distribute and manage libraries, RubyGems.org plays a crucial role in the growth of Ruby applications.