就是

就是 is an adverb meaning 'exactly' or 'precisely,' used to emphasize that something is exactly as stated, often for clarification or emphasis.

The character 就 (jiù) originally meant 'immediately' or 'then,' and over time it developed a nuance of emphasis or contrast. 是 (shì) is the verb 'to be,' used to affirm or identify. Together, 就是 emphasizes that something is precisely what was mentioned, with no ambiguity.

就 is commonly used in everyday conversation to highlight exactness or to confirm identity. It can also express a sense of inevitability or immediacy, depending on context. For example, 在北京就是首都 (In Beijing is the capital) is a simple way to state a fact with clarity.