How do deepfake videos work and how can they be detected?

Deepfake videos make it look like someone is saying or doing something they're not, kind of like a super-smart puppet show.

Imagine you have a photo of your friend, and you want to make it look like they’re talking on a phone. A deepfake uses special computer tricks to move their face and mouth as if they're actually speaking. It’s like giving the photo a robot brain that knows how to talk.

A deepfake starts with lots of photos or videos of the person's face. The computer learns what their face looks like from all these pictures, it's like learning how to draw a portrait by looking at many different drawings. Then, when you want to make a new video, the computer puts a new mouth or expression on their face, as if they’re saying something new.

Detecting deepfakes is like spotting a fake smile in a crowd. Sometimes, the edges of the face might look a little strange, like when you're tired and your eyes don’t quite match up. Or maybe the person’s eyes aren’t blinking right. A special computer can spot these tiny clues and say, “Wait a minute… this doesn’t look real!”