Karma is a numerical value in Fallout 3 that represents the player character’s moral alignment. Good actions, such as helping others or completing quests peacefully, increase karma, while evil actions, such as stealing or killing, decrease karma.
Karma has a number of benefits and drawbacks. High karma can give players access to exclusive dialogue options and quests, while low karma can make it more difficult to interact with certain NPCs. Karma can also affect the ending of the game.