What is the difference between rotation axis and equator

Answer 1

Look at this picture:

https://www.google.com/search?q=globe+with+axis+and+equator&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjLqNzs5argAhXFpFkKHQdoCqkQ_AUIDigB&biw=847&bih=504#imgrc=Uw-TYhQfk55G7M:

axis is line running from north pole to south pole through center of earth

circumference is line running around earth at its largest point halfway betwen north and south pole