Regions with seasonal reversals in the prevailing winds that result in wet summers and comparatively dry winters are known as monsoon circulation.
The disparity between yearly temperature changes across land and sea is the main driver of monsoons. From the Tropic of Cancer to the Tropic of Capricorn, the Sun appears to move in relation to the Earth. Consequently, the low pressure area caused by solar heating shifts latitude. Lower tropospheric winds during the summer are directed away from the colder maritime parts of the winter hemisphere and toward hot lands. The flow is reversed in the high troposphere, moving from the summer to the winter hemisphere. The extremely wet summers and dry winters that characterize almost all of the tropical continents are caused by monsoons.
Hence, pressure variation generates monsoon in atmosphere.
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