MyHeritage Deep Nostalgia is a tool that came out about 3 years ago and can add animation to static faces in your photos to bring life to them. People first tried it on historical images:

Then it became a trend on TikTok to upload images of relatives that have long since died. While it’s not perfect, it brought many to tears to see their loved ones again.

Of course, this can be a double-edged sword. This technology can bring the past to life, but it can also be used to create fake videos of living people.