Martin Buber\'s "I and Thou" is a philosophical work that explores the nature of human relationships. It examines the idea of a "dialogical" relationship between two people, in which each person is seen as an individual with their own unique identity and perspective
From Wikipedia
Martin Buber was an Austrian-Israeli philosopher best known for his philosophy of dialogue, a form of existentialism centered on the distinction between the I–Thou relationship and the I–It relationship.