This document summarizes four theories of motivation: 1) Instinct theory proposes innate tendencies determine behavior. 2) Drive reduction theory states needs motivate behavior to reach homeostasis. 3) Incentive theory says external rewards like social approval motivate behavior. 4) Cognitive theory posits thinking influences behavior through extrinsic and intrinsic motivation. It also outlines biological needs like hunger and social motives like bonding. Emotions involve feelings, arousal, and expressions, with theories arguing they are biologically based or reactions to social cues.