Martin Buber was a 20th century philosopher who developed a philosophy centered on dialogue. He described two types of relationships: I-Thou and I-It. I-Thou relationships involve seeing the other person as a whole being and engaging in mutual dialogue, while I-It relationships are detached and treat the other as an object. Buber believed human existence is defined by how we engage in dialogue with others, the world, and God. Dialogue for Buber meant a deep, genuine relationship where both persons acknowledge each other as equals. His philosophy emphasized the importance of relating to others through meaningful interaction and understanding their whole being rather than just isolated qualities.