Okay kiddo, a stereotaxic atlas is like a map that helps doctors and researchers find certain parts of your brain. Just like how a treasure map shows you where the treasure is hidden, a stereotaxic atlas shows scientists where different parts of the brain are located.
It's a bit like playing a game of "Pin the Tail on the Donkey" - doctors and researchers use the atlas to make sure they're putting medical tools or machines in the right place in your brain. And just like how you would feel a little poke if the tail was pinned in the right spot, doctors can do brain surgeries or studies with more precision if they use a stereotaxic atlas.