Catfish is a very popular show on MTV. It's about people that fall in love on the internet, thinking they are in love with someone who isn't who they say they are. For instance, Amy loves Bob and Bob likes Amy, but Bob makes a fake profile using another man's picture. Usually, it's an attractive person they use. So, Amy falls in love with the person in the picture. They never meet, they only see each other through the internet, and maybe some phone calls. This goes on for months, sometimes years. That's when Nev steps in and puts truth behind the picture.