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A process with two threads of execution, running on a single processor. Thread #1 is executed first, eventually starts Thread #2, and waits for a response. When Thread #2 finishes, it signals Thread #1 to resume execution to completion and then finishes. — A process with two threads of execution, running on a single processor

In computer architecture, multithreading is the ability of a central processing unit (CPU) (or a single core in a multi-core processor) to provide multiple threads of execution.