A soul is being able to exist in earth. Being able to feel and consider yourself a beautiful creature that was put here for a reason. A soul is something that has all of you in once place and it already knows everything you like and the emotions you carry and the moves you make. It's the brain for our whole body and why you do the things you do. It's a map that you don't know, but it knows.
Your soul is what makes a human a human, a cat a cat, a fish a fish.