Needs are something that is thought to be necessary or essential required for life. For example, as human, we need to food to eat and keep healthy. Water to drink to avoid from died of thirsty. Shelter to live for protection. And clothing to wear and keep us warm. If we don't have those, we can die for different situations.

On the contrary, wants are something that human desired to have and are not necessary to have. For example, entertainment, travel, designed clothing, video games, electronics, and so on. People can live without those things, however some people have desire for too much things. The reason for that can be because of pleasure and jealousy. Various people have different pleasure, but mostly it is for comparison to others.