How do deepfakes work and why are they considered dangerous?

Deepfakes are like fake faces on a video that trick people into thinking someone is saying or doing something they’re not.

Imagine you have a favorite cartoon character who always says "Hello!" when you press a button. Now imagine someone takes that same character and makes it say "Goodbye!" instead, but the drawing still looks just like the real one. That’s kind of how deepfakes work, they take a real video of someone and change what they’re saying or doing, while keeping their face looking normal.

Deepfakes use computer tricks to move someone's face in a video, like when you play with a photo on your phone. A computer looks at lots of pictures or videos of the person’s face, how it moves when they smile, frown, blink, or talk, and then makes new faces that look just like the real ones.

Deepfakes are dangerous because they can make people believe things that aren’t true. Imagine a deepfake video of your teacher saying "Everyone gets an A today!", you’d be super happy. But if it was a fake video of someone important saying something bad, people might get confused or even scared.

That’s why it's like having a sneaky friend who changes the message on your phone screen without you knowing!