时候 (shí hou) is a versatile noun meaning 'when' or 'time' — referring either to a specific point in time (e.g., 'at that moment') or a broader period (e.g., 'back then', 'during summer'). The character 时 (shí) means 'time' or 'hour', and 候 (hou) originally meant 'season' or 'period'; together, they emphasize temporal reference rather than duration or measurement. Unlike 时间 (shí jiān), which stresses measurable or abstract time, 时候 carries a more contextual, situational nuance — often tied to events, conditions, or personal experience.

This word frequently appears after demonstratives (e.g., 那时候, 这时候), interrogatives (e.g., 什么时候？), or in subordinate clauses introduced by when/while (e.g., 吃饭的时候). It’s common in both spoken and written Chinese but rarely used alone without a modifier — you wouldn’t say *‘我爱时候’; instead, it functions relationally: ‘at the time when…’, ‘back when…’, or ‘the time that…’.