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What is Ruby, and why is it popular?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
The Editors of Encyclopaedia Britannica

Ruby is a general-purpose, fully object-oriented programming language known for its programmer-friendly design. It became popular between 2005 and 2009 because of the release of the web framework Ruby on Rails, primarily used for web development. Other popular versions and implementations of Ruby include the lightweight implementation, mruby, and Ruby 3.0.