The law of karma is a fundamental concept in Hinduism that refers to the principle of cause and effect, where every action has consequences that affect one's future experiences. This law implies that good actions lead to positive outcomes, while bad actions result in negative consequences, not just in this life but also in future rebirths. Understanding this concept is crucial for followers of Karma Yoga, which emphasizes selfless action and the importance of performing one's duties without attachment to the results.