• An isolated, named collection of Ruby gems associated with a specific Ruby version, used to prevent dependency conflicts between different projects. Gemsets are managed by Ruby version managers like RVM (Ruby Version Manager) and allow developers to maintain separate sets of gem versions for different applications—for example, testing multiple versions of Rails or keeping project dependencies compartmentalized. That is, with RVM, Ruby installations have at least two gemsets: a “global” gemset (shared across all gemsets for that Ruby version) and a “default” gemset (used when no specific gemset is selected).

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