Have you ever heard the saying “What goes around comes around”? Or “What you give is what you get”? This is all related to Karma. What energy you give, whether is it good or bad, will come back to you.
For example, if you help an elderly lady cross the street, this will give you good Karma. But, if you laugh at a little boy falling and hurting himself and do nothing to help, this can give you bad Karma.
“(in Hinduism and Buddhism) the sum of a person’s actions in this and previous states of existence, viewed as deciding their fate in future existences.”
Your fate is in your own hands. It is believed your actions will create your own Karma. Therefore if you give good karma out into the world, good things will come back to you.
The theory of Karma as based on the Buddhist religion states, “Karma is the law of moral causation. The theory of Karma is a fundamental doctrine in Buddhism. This belief was prevalent in India before the advent of the Buddha. Nevertheless, it was the Buddha who explained and formulated this doctrine in the complete form in which we have it today.” –Buddhanet.net