Monsoons are seasonal winds that bring heavy rainfall to certain regions, particularly in South Asia. They occur due to the temperature differences between land and sea, causing air to move from high-pressure areas to low-pressure areas. This shift in wind patterns typically happens twice a year, resulting in wet and dry seasons. The most well-known monsoon is the Indian Monsoon, which usually starts in June and lasts until September. During this time, countries like India and Bangladesh receive significant rainfall, which is crucial for agriculture but can also lead to flooding and other challenges.