Reputation is an attribute representing your renown in the world. You earn reputation by the deeds you do while completing quests and your reputation can only increase, never decrease. The higher your reputation is, the more friendly people will be towards you, resulting in easier persuasion, lower vendor prices, and just generally nicer responses from people. (Yes, the Ordinators will eventually stop calling you "scum" every time you walk by them.) Additionally, 50 Reputation is one of the requirements to enable a possible shortcut in the Main Quest.
 Faction Reputation
Separate from your general Reputation are your Faction Reputations with the various Factions in the game. Unlike general Reputation, these can both increase and decrease. Generally, performing quests for one faction will raise your Faction Reputation for that faction. There are a few quests where in addition to this increase, you will get lower reputation with another group. (E.g. performing Mages Guild quests will increase your Mages Guild Reputation, but may lower your Reputation with House Telvanni.) Additionally, you may lose Reputation in factions of which you are a member if you fail quests (killing the person you were supposed to protect, etc.). Your Faction Reputation is used to modify your general Reputation when talking to members of any faction.
This is a list of all quests that will increase your general Reputation.
- Gra-Muzgob Informant (1 point)
- Vivec Informants (1 point)
- The Path of the Incarnate
- Visiting Nibani Maesa with lost prophecies (1 point)
- Pass Warrior's Test (1 point)
- Getting Moon and Star (5 points)
- Urshilaku Nerevarine (2 points)
- Ahemmusa Nerevarine (2 points)
- Zainab Nerevarine (1 point)
- Erabenimsun Nerevarine (1 point)
- Redoran Hortator (4 points)
- Hlaalu Hortator (4 points)
- Telvanni Hortator (4 points)
- Hortator and Nerevarine (5 points)
- Assault Dagoth Ur (10 points)
 Other Quests
* These points can be earned without being a member of the faction that gives the quest.
Grand Total: 173