Can you explain what is meant by the execution flow in a program?

A thread is a sequence of commands that the processor executes sequentially. Within a single program, there can be multiple threads that work in parallel or alternately, allowing multiple tasks to be performed simultaneously.

In Python, each thread has its own execution context, but due to the Global Interpreter Lock (GIL) in the standard CPython implementation, only one thread executes Python code at a time. Nevertheless, threads are useful for input-output operations or when using extensions that release the GIL.

Example of creating a thread in Python:

import threading

def worker():
    print("Thread is running")

thread = threading.Thread(target=worker)
thread.start()
thread.join()