Wants are things that you would like, but are not necessities in life. Ex. (Phone, Fancy car, Yeezys, etc.) Needs are thing that are required for living. Ex. (Water, Food, etc.)
This is a gross example, but if you are watching a movie in a movie theatre and you are at an important part of the movie, but you need to use the bathroom and there is a waterfall in the background, you need to use the bathroom, but you dont want to leave. a want is an optional thing, but a need is mandatory, like how you NEED food and water, but you WANT doughnuts and milk.