Karma is one of the most misunderstood aspects of Buddhism. In simple terms, Karma is the law of action and reactions. Our actions, both physical and thoughts, are the acts that are put in the world. Reactions can be referred to as their manifestations in the actor's life, i.e. our own life. For example, suppose your mind is filled with greed, evil thoughts like harming another person, and jealousy. In that case, it reflects restlessness as we will never be satisfied, punishments for harming another person, and stress to become like someone else, respectively. For a positive example, a life lived with generosity, righteousness, kindness, and genuinely putting good out there will lead to respect in society and a fulfilled life. Furthermore, Buddhism believes in reincarnation. So the good acts and deeds that one puts in this life, one also reaps the benefits in the next life. Therefore, the equation of Karma is relatively straightforward. Do good and work for the betterment of society and oneself.