The article reviews different aspects of the summer monsoon, focusing on its variations from seasonal to interannual and interdecadal scales. It discusses how the summer monsoon in subtropical regions can be defined by the expansion of tropical wet areas and cross-equatorial monsoon flows. The researchers explore the East Asian monsoon, the seasonal progression of the Asian summer monsoon, global monsoon patterns, and variations over years and decades. They also examine the connection between sea surface temperatures and monsoon changes, as well as the northernmost extent of the summer monsoon.