The Place of Vipassana in Buddhist Practice by Thanissaro Bhikkhu

"What exactly is vipassana?
Almost any book on early Buddhist meditation will tell you that the Buddha taught two types of meditation: samatha and vipassana. Samatha, which means tranquillity, is said to be a method fostering strong states of mental absorption, called jhana. Vipassana — literally "clear-seeing," but more often translated as insight meditation — is said to be a method using a modicum of tranquillity to foster moment-to-moment mindfulness of the inconstancy of events as they are directly experienced in the present. This mindfulness creates a sense of dispassion toward all events, thus leading the mind to release from suffering. These two methods are quite separate, we're told, and of the two, vipassana is the distinctive Buddhist contribution to meditative science. Other systems of practice pre-dating the Buddha also taught samatha, but the Buddha was the first to discover and teach vipassana. Although some Buddhist meditators may practice samatha meditation before turning to vipassana, samatha practice is not really necessary for the pursuit of Awakening. As a meditative tool, the vipassana method is sufficient for attaining the goal. Or so we're told."

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