What is the difference between red giant and red dwarf?

Hello there mate ;)

Well, a giant is a mythical creature made up in folktales about men who were as tall as mountains and the tops of their heads brushed against the stars, while dwarves were made out to be short, grumpy, even violent creatures who were ugly and greedy.

But yeah, the first answerer got it right, lol.

Ones tall, ones short.