When you combine 密 (secret) and 码 (code/number), you get 密码—a “secret code,” which is a perfect and literal description of a password.
Unlike culturally deep words like 关系 (guānxi) or 面子 (miànzi), 密码 (mìmǎ) is a modern, functional term with little historical baggage. Its significance lies not in ancient philosophy, but in its ubiquity in 21st-century China. In the West, we often use different words for different types of secret codes:
In Chinese, 密码 (mìmǎ) elegantly covers almost all of these scenarios. This linguistic simplicity reflects the rapid, all-encompassing nature of China's digital revolution. With mobile payments (Alipay, WeChat Pay), ubiquitous e-commerce, and shared bike schemes all requiring some form of access code, 密码 has become one of the most frequently used nouns in daily urban life. Its cultural importance is tied directly to the digital infrastructure that modern China runs on.
密码 is a neutral term used in all contexts, from casual conversation to formal banking instructions.