Okay kiddo, have you ever heard of the valkyries in Norse mythology? They are said to be these really cool women warriors who fly on winged horses and are really powerful.
Now, in some modern day beliefs and stories, a Valkyrie is often portrayed as a female superhero who is really strong and brave. She is often a member of a team of superhero characters who work together to save people and fight bad guys.
Sometimes, Valkyries are also seen as divine beings who can choose which people go to a special place called Valhalla after they die. Valhalla is kind of like a really cool heaven where brave warriors go to party and live happily ever after.
So in short, a Valkyrie is like a really awesome female hero or divine being who is really strong and brave and helps people in different ways.