Greetings friend,
Basically, Our psych plays a big role in everything we do, therefore FOMO and FUD are emotions that can make people buy or sell cryptocurrencies like the STEEM token based on those feelings rather than the actual value or performance of the token. So, when a lot of people start feeling these emotions, it can cause big swings in the token's price. It's like a rollercoaster ride driven by how people are feeling at the moment.

Good 👍 luck in contest friend.