So, you know how people have beliefs about what happens after they die, right? Well, in Buddhism, some people believe in a special kind of way of staying connected to the world after they die, called becoming a mummy.
Now, normally when people die, their bodies slowly start to break down and decompose. But some people believe that if a person is really good or special, then their body won't decompose and they will turn into a mummy instead.
This happens because these special people did things like meditate a lot, eat very little, and stay away from other people so they didn't get distracted from their spiritual goals. And when they died, their bodies were so pure and their spirits so strong that their bodies just stayed the same, instead of breaking down like everyone else's.
These mummies are usually kept in special places, like temples, so that people can come and visit them and remember the good things about the person who became the mummy. It's kind of like a way to honor them and keep them close, even though they're not alive anymore.
So that's basically what Buddhist mummies are - special people who stayed the same after they died and are kept in special places so people can remember and honor them.