The document discusses emotions from several perspectives. It defines emotions as feelings that influence both physiology and behavior. It describes the intrapersonal, interpersonal, and social functions of emotions. Key features of emotions are that they are expressed through nonverbal behaviors and directed by arousal. Basic emotions include anger, disgust, fear, happiness, sadness, and surprise. Emotions also combine and are influenced by both biological and social factors. Theories on the origins and experience of emotions are presented, including the James-Lange, Cannon-Bard, and Schachter-Singer theories.