'当然' (dāng rán) is an adverb meaning 'of course', 'certainly', or 'naturally'. Literally, 当 (dāng) means 'to be' or 'to serve as', and 然 (rán) means 'so', 'thus', or 'in this way'; together they convey the sense of something being self-evident or logically inevitable. It expresses strong agreement, affirmation, or acknowledgment of something obvious or expected.

This word is commonly used in spoken and written Chinese to respond affirmatively—especially to questions implying expectation—and to emphasize inevitability in statements. It often appears at the beginning or middle of a sentence and carries a polite, confident, and cooperative tone. While it can occasionally sound slightly formal or emphatic depending on intonation, it’s widely appropriate in everyday conversations among friends, colleagues, or service interactions.