Karma - Its nothing but a Residue

This is the definition I have finally arrived. If we are doing any task, karma is nothing but the residual effect in your mind related to that task once its done. Thats it. 

For example, if you are doing any task and once it is done, if you start thinking that may be you could have done it better, or if you could have caused any harm to anyone, or if you have accumulated any guilt or even joy. It doesnt always have to be on the negative side, it can also be positive if you think that you have helped someone and you strongly feel about it. 

Sometimes, we naturally help people that we love without even expecting anything. You wont feel either good or bad after that. You will feel a sense of relief. That means some burden has been reduced from your brain.