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75. What is Process and what is Thread

A process is an instance of a program that can be executed by a computer. It includes a memory space, system resources, and a set of instructions that can be executed in order to carry out specific tasks. A process can be seen as an individual task or program running on a computer system.

A thread is a lightweight process that can run concurrently with other threads within the same process. Each thread has its own stack, program counter, and registers. Threads share the same memory space, system resources, and code as the process that created them. Since threads are lighter, they can be switched between faster and more frequently, enabling parallelism and speed in the execution of tasks.

In summary, a process is an executing program, while a thread is a unit of execution within that program. Threads are used to enable concurrent execution of tasks within a single process.