The west side or west bank of a place; can also refer to the Western bloc or Western countries in political contexts.
川の西側には広い公園がある。
There is a large park on the west side of the river.
町の西側は新しい住宅地が増えている。
New residential areas are increasing on the west side of town.
冷戦時代には、西側と東側で政治的な対立があった。
During the Cold War, there was political confrontation between the West and the East.