Concurrency vs$.$ Parallelism

Concurrency in threads refers to the ability of a program to manage and execute

multiple threads simultaneously.

$$ The primary goal of concurrency in threads is to improve the overall

responsiveness of a program by allowing it to continue making progress even

when some threads are blocked or waiting, such as during I$/$O operations.

Parallelism in threads involves executing multiple threads or thread tasks

simultaneously, where each thread is genuinely executing at the same time on

multiple CPU cores or processors.

$$ The primary goal of parallelism in threads is to improve the computational speed

of a program by dividing a task into smaller sub$-$tasks that can be executed in

parallel.