"Mission givers are the primary Non-Player Characters (or NPCs) that you can engage in conversation. Right-click on mission givers to converse with them. In these cinematic conversations, you will be presented with response choices. To respond to an NPC, left-click on a response option or press the appropriate numbered key.
Light Side/Dark Side Points: Some conversation responses will reward you with light side or dark side points. Your conversation choices can change your light side/dark side levels. You can check your light side/dark side level by opening the Character Sheet panel. Some items you find in the world have level requirements (such as Light Side III) before they can be used. These items can often be purchased at vendors throughout the game.
Social Points: You can earn social points by joining missions and conversations with other players. You can win more social points by winning (and even losing) conversation rolls. You can view your social score on your Character Sheet. Some items you find in the world have level requirements (such as Social II) before they can be used. These items can often be purchased at vendors throughout the game."