Screenwriting - Want and Need

A character has a Want -

The want is meaningless

"I want a box of condoms"

A character has a Need

The need gives meaning.

"I want to give the box of condoms to my daughter so that she doesn't get pregnant or sick."

The "character need" is also called motivation, co-want, relationship connector, etc.

Now if the need is selfish, you may be talking about the antagonist.

"I want to use the condoms on escorts while my wife is at home with our sick child."

So, the want is always meaningless

and the need gives the meaning

The need gives the relationship connection