A primary thread is started whenever a .NET program is started. Additional threads are created by this primary thread to execute the application login either concurrently or in parallel. These threads are called worker threads. These threads can execute any part of the program code, which may include parts that are executed by another thread. As these threads are free to cross application boundaries, .NET Framework provides a way to isolate these threads within a process using application domains (not available in .NET Core).

If our program can perform multiple operations in parallel, it will drastically decrease the total execution time. This can be achieved by utilizing multiple threads with multiprocessors or the multicore environment. The Windows operating system, when used alongside .NET Framework, ensures that these threads...