What is KuuDere and DanDere?

So what is KuuDere and DanDere?

KuuDere
An anime/manga slang term for a character that is cold, blunt, cynical, and pretty much doesn't care if her beloved dies. That's what she is on the outside but she is actually caring and nice on the inside.

Differs from tsundere since tsundere is when the character frequently runs hot and cold between tsun and dere. Kuudere is when the character only occasionally shows her caring side.

DanDere
A dandere is a character archtype that entails someone being quiet which is usually associated with shyness. "Dan" comes from the word "danmari" which means silent and taciturn. "Dere" means to become "lovey dovey".

Not to be confused with Kuudere which is a cool person that becomes lovey dovey. They are very similar in appearence and possibly behavior, but their underlying character reasoning is different. Being silent for the sake of being silent vs being cool.