noun which may take the genitive case particle 'no', noun
public; communal
Refers to facilities, services, spaces, or interests shared by the community or provided by the government, as opposed to private or individual. Often used in compounds like 公共施設 (public facilities) and 公共交通 (public transportation).
この公園は公共の場ですから、ゴミは持ち帰ってください。
This park is a public space, so please take your trash home with you.
公共の交通機関を利用する人が増えている。
More people are using public transportation.