Okay kiddo, you know how sometimes when you look at things really, really close up they look different or even weird? Well, imagine if you had a super special camera that could take pictures of things that are too small for even your eyes to see. That's kind of what an electron microscope does. It's like a superpowered microscope that uses a beam of electrons instead of light to look at things that are even smaller than cells in your body.
The electron microscope creates really detailed pictures that scientists can use to learn more about how things are made up and how they work. But sometimes, when scientists take pictures with their electron microscopes, they want to share those pictures with other scientists so they can all learn from them.
That's where the electron microscopy data bank comes in. It's kind of like a big library of electron microscope pictures. Scientists from all over the world can send their pictures to the data bank and then other scientists can look at them and learn new things about what they see.
But not just anyone can look at the pictures in the data bank. Scientists have to apply for permission and follow certain rules to make sure they use the pictures responsibly and don't share them with people who shouldn't see them.
So, in summary, the electron microscopy data bank is a collection of super detailed pictures taken with electron microscopes that scientists use to learn new things about really small things.