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The major difference between threads and processes is
1.Threads share the address space of the process that
created it; processes have their own address.
2.Threads have direct access to the data segment of its
process; processes have their own copy of the data segment
of the parent process.
3.Threads can directly communicate with other threads of
its process; processes must use interprocess communication
to communicate with sibling processes.
4.Threads have almost no overhead; processes have
considerable overhead.
5.New threads are easily created; new processes require
duplication of the parent process.
6.Threads can exercise considerable control over threads of
the same process; processes can only exercise control over
child processes.
7.Changes to the main thread (cancellation, priority
change, etc.) may affect the behavior of the other threads
of the process; changes to the parent process does not
affect child processes.
also
Process is a program in execution where as thread is a
seperate path of execution in a program.
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