Monsoon winds are seasonal reversing winds that are caused by the uneven heating of the continents and oceans.
Winter monsoon winds: During winter, the continent cools off quickly and creates a high pressure region in the interior of the continent. However, the Indian Ocean in the south has lower air pressure because the ocean is warmer than the land. As a result, cold winds blow from the interior of the continent towards the ocean. These winds that blow from the continent towards the ocean in winter are called winter monsoon winds.