Many systems provide support for both user and kernel threads, resulting in different multithreading models. There are three common types of threading implementation:
1. Many-to-one Model - maps many user-level threads to one kernel thread.
2. One-to-one Model - maps each user thread to a kernel thread. It provides mode concurrency than the many-to-one model by allowing another thread to run when a thread makes a blocking system call.
3. Many-to-many Model - The many-to-many model multiplexes many user-level threads to a smaller or equal number of kernel threads. The number of kernel threads may be specific to either a particular application or a particular machine.
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