"Six Degrees of Separation" is a theory suggesting that any two people in the world are connected through a chain of acquaintances that has no more than five intermediaries. This concept highlights the interconnectedness of human relationships, implying that we are all closer than we might think. The idea gained popularity in the 1960s and was later explored in various forms of media, including the play and film titled Six Degrees of Separation. It emphasizes the potential for social networks to bridge gaps between individuals, regardless of geographical or cultural differences.