This technology consist of endless functions that are working together like a orchestra.
But, not all of them are in use permanently.
So, some of the technologies (more than one) are exactly what you asked for.
In order which ones-you must read more about the computer functions and you will see that your question has plenty of answers.
Now, if you want more precise answer you must get into the computer’s world.
Do it. You will benefit a lot.