Explanations of enlightenment vary depending on the tradition. In Buddhism, enlightenment is usually seen as an awakening to the absolute Truth, which releases the enlightened individual from the cycle of reincarnation.
In Hinduism, it is described as a divine, transcendent experience. Sometimes it is described as a sudden, transformative moment of awakening and other times it is seen as a more gradual process of being liberated from the bondage of the mind.
In terms of paths to enlightenment, different schools of yoga and philosophy prescribe different routes. For instance, classical Advaita Vedanta promotes Jnana yoga as a way of attaining enlightenment through spiritual study, whereas Bhakti yoga pursues enlightenment through devotion and the worship of God.
Many yogis and gurus agree that enlightenment is not really a state that we have to reach because, in a sense, we are all already enlightened. Therefore, the goal of the spiritual journey is to uncover what is already there. Enlightenment means revealing or remembering what our true, original nature is.