广告 (guǎnggào) literally combines 广 (guǎng), meaning 'broad' or 'extensive', and 告 (gào), meaning 'to announce' or 'to inform'. Together, they form the noun 'advertisement' — a message designed to promote a product, service, idea, or event to a wide audience. It is a neutral, formal term used across media: TV, radio, print, online platforms, and public spaces like billboards or subway stations.

This word appears frequently in everyday life — from news reports about marketing strategies to casual conversations about skipping commercials. Unlike colloquial terms like 广告片 (guǎnggào piàn, 'ad video') or 软文 (ruǎn wén, 'sponsored content'), 广告 is the standard, all-purpose noun for any paid promotional communication. It can be countable (e.g., 一则广告 yī zé guǎnggào, 'an advertisement') or used collectively (e.g., 看广告 kàn guǎnggào, 'watch ads').