The entire eighth and ninth books of Nicomachean Ethics, one of Aristotle's most famous and influential treatises, are dedicated to friendship. The philosopher not only considers it necessary but also beautiful: no one would desire a life without friends, no matter how rich it might be in other benefits. Friendship is, therefore, an indispensable virtue at every stage of life and for every human community. But aren't there different types of friendship? And are they all equally virtuous? Some relationships are based on pleasure, others on convenience, and others simply on the desire of both parties to do good and to offer mutual gifts. Which are more lasting and have more beneficial effects, even in political life? A lively reflection that challenges the reader to reflect on a dimension of individual and collective existence without which we would not know civilization.