Compared to "needs", wants are physical or psychological desire for being, possessing, or doing something.
A desire is, in itself, a whim, or a vacuous emotion, that does not lead to any specific consequence. A want does not fall within a sequence, as it does not constitute origin nor ending, with the exception of the wants that come out of true motivation.
Hence wants are:
1. based on physical or psychological feelings
2. mainly ruled by emotions
3. not necessary for any specific course of action
4. mostly important for the building of motivation