There are four paths of yoga to achieve self-realisation. Detachment is key in all four paths of yoga.
Karma Yoga is the path of actions/deeds. Karma is derived from the Sanskrit word Kri – to do. Every deed is karma. In philosophy karma means the result of actions. But, in Karma Yoga, karma means work. Nobody gets what he does not deserve, this is the eternal law of karma. The law of karma means cause and consequence. According to the Sankhya philosophy nature is composed of three forces denominated in Sanskrit by Sattva, Rajas and Tamas. In our world this is manifested as balance, activity and slowness. Tamas is characterised by darkness and inaction, Rajas in activity expressed by attraction and rejection and Sattva is the balance between action and inactivity. Karma Yoga, in particular, has to do with these three forces. To study Karma Yoga we have to know what duty is. We have to help others without asking anything. What is Karma Yoga? The Knowledge of the Secret of the work. Whole universe works, for salvation, for freedom. Karma Yoga is the Science of Work.