更改 (gēng gǎi) is a formal, written verb meaning 'to change' or 'to revise', especially when modifying existing information, plans, documents, or settings. It emphasizes deliberate, official, or systematic alteration—not casual or spontaneous change. The character 更 (gēng) means 'to replace' or 'to renew', while 改 (gǎi) means 'to alter' or 'to correct'; together they form a compound stressing purposeful revision. This word is commonly used in administrative, technical, and professional contexts—such as updating personal details, correcting data, or amending contracts.

Unlike more colloquial alternatives like 改 (gǎi) alone or 换 (huàn), 更改 carries a tone of formality and intentionality. It is rarely used for physical objects or people directly (e.g., you wouldn’t say ‘更改一个人’), but rather for abstract or documented items: names on forms, flight times, software configurations, or policy wording. It often appears in written notices, system prompts, or official communications—making it essential for learners engaging with bureaucratic or digital Chinese environments.