Process

• A process is a program in execution.
• Every process has its own address space.
• A process refers to the concurrently running entity on the system with tight protection.
• processes interact only through system-provided inter-process communication mechanisms.
• processes are typically independent.

Threads

• A thread is just an independent execution (trace) through the code of a process.
• In order to create threads, first you need a virtual address space, which is instantiated when the process is created.
• Threads are also called as light weight process ( because they don’t need separate resource allocation ) .
• Threads have full access to utilize it’s parent process resources (also termed as loose protection).
• Threads refers to the concurrently running entity within the process.
• Threads uses address spaces of the process.

Task

• A task refers to the concurrently running entity on the system with loose protection.
• A task is simply a set of instructions loaded into the memory.
• A task needs a thread to execute.
• A specific instance of executable code and its data environment.