I think that every single one of you has heard about the concept of karma at one point in your lives. It's kind of hard not to because we all experience the irony of life sometimes and what better way to describe this irony if not by saying it's Karma's fault! !
So for those of you who haven't heard about this concept, even though I doubt there is anyone who hasn't, Karma is the concept of balance in life. To put it in more simple words, it's main ideea is : "what goes around, comes around". And no, that's not a refference to 2006's Pop Hit by Justin Timberlake.
So yeah, you can think about this concept as the balance of life. It is something that mentains a constant equilibrium within the various aspects of our little and short existance.
You know, there is a law in physics wich states that for every action in the universe, there must be an opposite and equal reaction. This is how our karma is thought to be working too. For every good thing that you do, you shall be repaid with another and for every bad thing that you do you shall be repaid with another. We can think about it as a silent vigillante.
Usually, the people that believe in this concept also believe in reincarnation. Karma doesn't work on a small scale as for example: "I give a homeless guy 1$ today and tomorrow i will recieve 10$" or any variation of such an ideea. The concept of Karma works on a larger scale. It includes all of the lives that you have supposedly lived. This way, your current life is the result of all of your past lives, gathered as a whole in the karmic vault. This was also a way for some believers to explain why good people sometimes have a bad fortune and sometimes people who didn't deserve a thing in the world, had everything they ever wanted.
The karmic energy feed on everything that we do, everything that we don't do, everything that we think, that we say, influence and so on. It is an omnipotent, omnipresent and omniscient force. It basically knows everything about you, your intentions, your actions and your values. N.S.A. sound like a little kid now, xD. So basiclly we have this energy stored within us, the energy that is the result of all that we are and represent. Now, it's up to us to choose wich kind on energy we want to use to fill our voids because it will come back at us. Do good, and good will come to you. Love and you shall be loved!