• In an operating system, a thread is the smallest unit of computation that may be done. A thread resides within a process in most modern operating systems, which means that a single process can include numerous threads.
• The lightweight process is also known as a thread. By dividing a process into many threads, parallelism can be achieved. Multiple tabs in a browser, for example, can represent different threads. MS Word makes use of numerous threads: one to format the text, another to receive inputs, and so on.

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