“Avoir besoin de” means “to need.” To use this expression, you have to conjugate the verb “avoir” (to have) directed toward whom you are speaking.
Tu as besoin de ce journal. – You need this newspaper.
Vous avez besoin de son aide. – You need her help.
And as you can see, it is mandatory to add the little word “de” at the end. So for example, you would say:
Elle a besoin de fleurs (she needs flowers) and not “Elle a besoin fleurs.”
J’ai besoin d’un café (I need a coffee) and not “J’ai besoin un café.”
Additional examples:
Nous avons besoin de partir en vacances. – We need to go on a vacation.
Il a besoin d’amour. – He needs love.
Carla a besoin d’une robe noire. – Carla needs a black dress.