Stratification refers to systematic inequalities between groups that arise from social processes and relationships. Social stratification creates a hierarchy in society where groups have unequal access to resources, power, and social worth. It can take various forms like class, race, and gender, which overlap and influence life chances. Theories of stratification like functionalism see it as necessary for society, while conflict theory views it as certain groups exploiting others. Stratification is evident in the United States through inequality in income, wealth, health outcomes, and poverty rates along racial and gender lines.