This document discusses several key concepts relating to culture. It begins by explaining that while humans share many biological similarities, we exhibit significant cultural variations in behaviors, languages, customs and environments between different groups. It then explores how cultures form and diversify over time based on environmental and social factors. The document outlines some universal cultural traits shared by all societies, such as family units, as well as variations within and between cultures including subcultures, countercultures, high culture and popular culture. It also examines perspectives like ethnocentrism, cultural relativism and causes of cultural change over time.