“Karma” literally means “deed” or “act” or “action” and more broadly names the universal principle “cause and effect”, action and reaction, which Hindus believe governs all life on this planet.
A cause is something that makes something else to happen. That ‘something else’ is the effect (Result) of the cause. Out of two events, cause is the event that happens first and effect follows. If a ball is kicked off, it starts moving. The ‘kick’ is the cause and the movement of the ball is the effect.
In physics Newton’s third law of motion says: ”For every action there is an equal and opposite reaction.” Every cause has its effect like every action has its reaction. But the law of motion – action and reaction is well defined with its magnitude. Whereas Hindu philosophy of ‘Karma’ is similar to the law of motion but can not be measured. However, ‘the return or the ‘effect’ what we get as a result of ‘Karma’ can be seen or felt or experience in our life which may be ‘good’ (positive) or ‘bad’ (negative). So the ‘reaction’ or ‘effect’ of ‘Karma’ has two components and it depends on the “Karma” (“Cause”) done by the individual. If your Karma is Good the ‘reaction’ (the fruit) will be good and vice versa.
According to the Vedas, if we sow goodness, we will reap goodness; if we sow evil, we will reap evil. As you sow so you reap” This is the Law of Karma.
Interestingly, both science and religion meeting at a point where both agree to the law of Karma.