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RB threads, or Ruby threads, are a concurrency feature in the Ruby programming language. They allow multiple sets of instructions to execute simultaneously within a single Ruby process. Threads can be created using the `Thread.new` method and have their own call stacks, allowing for parallel execution of code. However, it's important to note that in Ruby, threading is not true parallelism due to Global Interpreter Lock (GIL). This means that only one thread can execute Ruby code at a time, while other threads are blocked. Consequently, RB threads are more suitable for IO-bound tasks rather than CPU-bound ones. Additionally, caution must be taken when working with shared resources to avoid race conditions and thread synchronization issues. Despite these limitations, RB threads provide a convenient way to handle concurrent tasks in Ruby programs.

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