NEED - A need is something that a person must have in order to live. Without that, a person will suffer mentally or physically.
WANT - A want is a choice, which depends on a person to work for it or not. A desire which can be fulfilled or not. Life will continue if a person doesn't get what they want.
Having a watch is need but having a Roger watch is wanted.
Having a friend is a need but having a boyfriend is a want.
Having food is need but having it in a restaurant is want.
Having a phone is need but having an expensive iPhone is want.
People should focus on 'NEEDS' so that they can get their 'WANTS'