The term “karma yoga” means “Path to Mergence with God through performing selfless service”. Karma Yoga is the science of action. Karma yoga focuses on the adherence to duty (dharma) while remaining detached from the reward.
It states that one can attain Moksha (salvation) by doing his duties in an unselfish manner. Karma refers to the universal principle of cause and effect. Yoga believes that your present situation is based on your past actions. Karma Yoga is the path of service; it refers to the energy of action. This path requires you to be selfless. Performing a selfless service is the essence of Karma Yoga or consciously choosing a future that is free from negativity and selfishness knowing that your life is a consequence of your past actions. Karma Yoga practices try to change your action towards the good - good words, good thoughts, good deeds, in order to change your soul. By being selfless, you change your consciousness which leads to a change in your destiny.