What is a deepfake? How to spot one before it fools you.

Faked videos are becoming increasingly popular on the internet. They go by the name ‘deepfake’ – a combination of the words ‘deep learning’ and ‘fake videos’. Experts say the more convincing the videos are, the more dangerous the technology becomes. Could deepfake videos be a threat to national security? And how can you spot the difference between what’s real and fake?