Need is something that is necessary for an organism to live a healthy life. A need

A need is something that is necessary for an organism to live a healthy life.

 A need is described as something we must have to survive. Needs include things such as:

• 
  a place to shelter you from the elements and keep you safe -- a home for example.
  
• 
  access to food and water -- without both we would eventually die.
  
• 
  oxygen -- without it we would suffocate.
  

So if the only human needs we have are listed above, what do we call the other things we believe we must have to live happily? These are called wants. Wants can be any number of things including wanting to be in a relationship, like Jane, to wanting the latest high-definition 50-inch flat-screen television. What distinguishes wants from needs is that they are not necessary for our survival. Just as Jane can go on to live a life without Eric, we can similarly live a life without a 50-inch flat-screen television.

Here are some additional examples of wants:

• 
  taking a yearly vacation
  

1. 
   Wants are often distinguished from needs. A need is something that is necessary for survival (such as food and shelter),
   
2. 
   whereas a want is simply something that a person would like to have.^[1] 
   
3. 
   A motive is something that causes us to act or behave in order to reach a a goal or desired endpoint. It comes from the latin word that means 'moving'. A motive is the reason WHY you do something. ... In criminology a motive is the reason an individual committed a crime or offense.