Where (adverb) – où
(Pronounced oo)
To remember that Where is pronounced oo (où) in French, use the following mnemonic:
Where did it hurt most? Where the puss oozed (où) from the wound.

Examples of où (where) in a sentence
Où habitez-vous?
(Where do you live?)
C'est la maison où j'ai grandi.
(It is the house where I grew up.)
Je ne sais pas où aller.
(I don't know where to go.)