账户 (zhàng hù) literally combines 账 (zhàng), meaning 'account' or 'record of financial transactions', and 户 (hù), meaning 'household' or 'user'. Together, they refer to a formal record or identity used to manage money, access services, or track activity — most commonly in banking (e.g., bank account) or online platforms (e.g., email or social media account). Unlike the more general term 号 (hào, 'number'), 账户 emphasizes authorized access and personal ownership.

This word is neutral in register and widely used in both spoken and written Mandarin. It appears frequently in financial documents, app interfaces, customer service, and official forms. While it can technically refer to any registered user profile, it carries a stronger connotation of financial or institutional legitimacy than terms like 用户 (yònghù, 'user').