This document summarizes key aspects of intersectionality theory as developed by Patricia Hill Collins. It discusses how intersectionality examines how gender, race, class, and sexuality intersect and interact to create social inequalities. It focuses on Collins' work developing black feminist thought, which centers the experiences of black women and validates their distinct forms of knowledge production. Collins argues inequality results from the intersecting forces within the matrix of domination, and examines oppression on individual, group, and institutional levels.