Karma means action, work or deed. 
Karma also stands for the consequences of a mental or physical activity.
In Hinduism and Buddhism, Karma denotes the sum of a person’s actions in this and previous states of existence, viewed as deciding their fate in future existences.
It refers to the spiritual principle of cause and effect where intent and actions of an individual (cause) influence the future of that individual (effect).
Good intent and good deeds contribute to good karma and future happiness, while bad intent and bad deeds contribute to bad karma and future suffering.