In the present indicative, volere means "want":

Voglio quell'automobile. (I want that car.)

In the present perfect (conversational past), volere is used in the sense of "decided, refused to":

Ho voluto farlo. (I wanted to do it-I decided to do it.)

Marco non ha voluto finirlo. (Mark didn't want to do it; Mark refused to do it.)

In the conditional, volere means "would like":

Vorrei un bicchiere di latte. (I would like a glass of milk.)

Vorrei visitare i nonni. (I would like to visit my grandparents.)