This document discusses the concepts of power and solidarity in sociolinguistics. It defines power as the ability to control another's behavior, which can stem from physical attributes, wealth, age, or social roles. Solidarity refers to the shared characteristics between speakers, like attending the same school or sharing a profession, religion, or background. Languages signal power and solidarity through pronouns like "tu" versus "vous" in French, which convey intimacy versus distance. Over time, relationships can change - solidarity may increase as people grow closer, and power dynamics can shift as social roles and circumstances change.