Books eight and nine of the Nicomachean Ethics, one of Aristotle's most famous and influential treatises, are entirely dedicated to friendship. The philosopher not only considers it necessary, but also beautiful: no one would wish for a life without friends, however rich it might be in other goods. Friendship is, therefore, an indispensable virtue at every stage of life and for every human community. But aren't there various types of friendship? And are they all equally virtuous? There are relationships based on pleasure, others on convenience, and others only on the will of both parties to do good and give gifts to each other. Which ones are more lasting and have more beneficial effects even in political life? A lively reflection that calls on the reader to think about a dimension of individual and collective existence without which we would not know civilization.