Question

differentiate between amateurs and professionals?

Answer 1

Amateurs are basically people who do an activity because they enjoy doing it.They may be getting paid,they may not be.

Professionals,on the other hand,are people who do an activity because it's their job.They earn their living through hat activity.Like the NBA players,they play basketball and it's their source of livelihood.
Hope,I made it clear to you. :)

Answer 2

Ameteurs who played cricket for pleasure.They are known as Gentlemen.
Professionals who played cricket for living.They are known as Players.