The advantage of using threads in Operating System:

• A thread is a flow of execution through the process code that has its own programme counter to keep track of which instruction to execute next, system registers to maintain its current working variables, and a stack to keep track of the execution history.
• Threads reduce the amount of time it takes to transition between different contexts.
• Within a process, threads allow concurrency.
• Communication that is effective.
• Creating and context switching threads is more cost-effective.
• Threads enable multiprocessor systems to be used at a larger scale and with higher efficiency.
• The main thread can be freed up by using threads.
• Threads can be used to split down a task into smaller, concurrently executable components.

Read More: What is a compiler in Operating System?