'注册' (zhù cè) is a verb meaning 'to register' — most commonly used when signing up for an online account, service, or official system. The character '注' means 'to pour in' or 'to direct attention/energy toward', suggesting the act of formally entering information; '册' originally meant 'a book' or 'register', implying official recording. Together, they convey the idea of formally entering one's details into a system or ledger.

This word is widely used in digital contexts (e.g., registering for apps, websites, or government platforms), but also appears in formal non-digital settings like school enrollment or business licensing. It implies an official, often mandatory or prerequisite, step before gaining access or recognition. Unlike casual sign-ups, '注册' carries a tone of formality and record-keeping — you don’t '注册' for a coffee shop loyalty card, but you do for a bank app or university portal.