Computer science: significance of multiple cores

Self-tutoring about computer design: the tutor comments on what “multiple cores” means.

As I understand, the benefit of a multi-core processor is that each core can work its own job simultaneously with the others. However many cores there are, that’s how many separate tasks a computer can work on at once.

Source:

Silberschatz, Galvin and Gagne. Operating System Concepts. Danvers: John Wiley & Sons, 2018.