A thread is created by a process, and it can be scheduled and executed independently of its parent process.
Processes start out with a main thread. The main thread can create new threads using a thread fork system call. The new threads can also use this system call to create more threads. Consequently, a thread not only belongs to a process; it also has a parent thread - the thread that completed it.
A process, in the simplest terms, is an executing program. One or more threads run in the context of the process. A thread is a basic unit to which the operating system assigns processor time. A thread can perform any part of the process code, including parts currently being performed by another thread.
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