百分比 literally means 'hundred-part ratio' — 百 (bǎi) means 'one hundred', 分 (fēn) means 'part' or 'division', and 比 (bǐ) means 'ratio' or 'comparison'. Together, they express a value as a fraction of 100, used to compare quantities proportionally. It's the standard term for 'percentage' in formal and everyday Chinese, appearing frequently in statistics, finance, education, and daily life — for example, when discussing exam scores, discounts, or population data.

Unlike English, where 'percent' often follows a number (e.g., '75 percent'), 百分比 is typically used *after* the noun it modifies or in subject-predicate constructions (e.g., '这个项目的成功率是95%' or '成功率达到了95%'). The character 比 here does not mean 'to compare' as a verb but functions as a noun meaning 'ratio' — a key nuance learners should note to avoid confusion with the verb 比 (bǐ).