關鍵字（keyword / index term），亦都叫做關鍵詞，係指一個捕捉到一份文獻嘅重點嘅字。
例如家陣有一柞學術文獻，呢啲文獻冚唪唥都係喺度討論量子力學嘅，噉呢柞文獻嘅關鍵字就係「量子力學」，而想摷資料嚟睇嘅人可以喺搜尋器嗰度打「量子力學」嚟摷[1]。
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