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A process provides the resources needed to execute a program. A process has a virtual address space, executable code, etc. Each process is started with a single thread, often called the primary thread, but can create additional threads from any of its threads.

A thread is an entity within a process. All threads of a process share the same virtual address space and system resources.

A process is an executable instance of a program while A thread is a subset of a process.

A process has its own virtual address space and doesnt not share its memory with other processes while a thread shares the same memory with other threads.

In the address space of threads only registers and stack is private, code segment, data segment and heap are shared, but each process has its own address space, using processes the context switch would have more overhead while using threads the overhead of context switches would be eliminated.

Threads actually execute the program and process just holds all the resources i.e. PCB process control block.