What is the difference between Process and Threads?
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Answer Posted / hetal
A process is a running instance of a program to which system allocates resources like CPU time and memory (separate heap, method area etc. which does not overlap with other process running on the system at the same time). In a big application there may be a set of cooperating processes communicating to each other in order to perform the desired functionality. Two processes communicate through well defined inter process communication mechanism, such as pipes, sockets and shared memory, if both processes are running on the same machine.
On the other hand threads exist within a process; every process has at least one thread. A thread is a light weight process that does not require as much resources as a process requires. Threads running inside a process, share the common set of resources among themselves which are allocated to the process (including the memory, the address space). All the threads share the same heap and method area (but individual stacks). All local variables are thread safe in Java because local variables are stored in each thread's own stack and each thread has its own stack created. Because threads share virtual address space, that makes inter thread communication between threads much cheaper than inter process communication between two independent processes
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