Prejudice is a belief or judgment made before or without due consideration of the facts.
Discrimination is acting on your prejudice.
I have recently heard of discrimination being condemned, but prejudice by contrast being ‘acceptable’. This is dangerous territory. In Orwell’s ‘1984’ there was attempted policing of the very thoughts of society. To think contrary to the status quo was a criminal offence. I defend the right to free thought vehemently, but in doing so please be careful not to defend prejudice as well.