Vipassana is usually translated as "Insight" meditation, most associated with the Theravāda tradition, but also present in some other traditions such as Tiantai. Often combined with śamatha meditation. Vipassanā (Pāli) or vipaśyanā in the Buddhist tradition means insight into the true nature of reality, namely as the Three marks of existence: impermanence, suffering or unsatisfactoriness, and the realisation of non-self.
Vipassanā meditation is an ancient practice taught by Buddhas, reintroduced by Ledi Sayadaw and Mogok Sayadaw and popularized by Mahasi Sayadaw, S. N. Goenka and the Vipassana movement, in which mindfulness of breathing and of thoughts, feelings and actions are being used to gain insight in the true nature of reality. Due to the popularity of Vipassanā-meditation, the mindfulness of breathing has gained further popularity in the west as mindfulness.
Example via www.mindpodnetwork.com: A Quote About Happiness from S.N. Goenka