Ruby is not just a programming language, but an entire philosophy about programming. It makes programming fun, productive, and rewarding. Most programs consist of code that needs to be organized into functions. And so most Ruby programs consist of classes and modules containing useful functions for interacting with the real world, operating on text, working with objects, creating GUIs, doing system administration tasks, building web applications… you name it. Ruby is at its heart a toolkit for accessing existing libraries like OpenSSL and providing something like Visual Basic style syntactic sugar to make working with them fun.
Maven Central Repository is a repository provided by Maven community. It contains a large number of commonly used libraries which are mostly 3rd party software. When Maven does not find any dependency in local repository, it starts searching in central repository using following URL. Maven makes it easy to find and use libraries in your multi-module projects. Maven Central Repository assists you in locating and using components from major libraries. If an artifact is not present in the local repository, the central repository can be reached through a custom proxy configuration. You could also download dependency directly from the central repository, perhaps because an unstable release is required, or if no version of the component has been released by your project team yet.
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Check this article to learn how YUM repository and metadata work internally.
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