In many respect threads operate in the similar way as that of processes. A number of the similarity and differences are:
Similarities
• Similar to processes threads share CPU and only one thread active (running) at a time.
• Similar to processes, threads within processes, threads within processes execute sequentially.
• Similar to processes, thread can create children.
• And similar to process, if one thread is blocked, another thread can run.
Differences
• Dissimilar processes, threads are not independent of one another.
• Dissimilar processes, all threads can access every address in the task.
• Dissimilar processes, threads are design to aid one other. Note that processes might or might not aid one another because processes may originate from many different users.