引用 means 'to quote or cite' — it's the specific verb for reproducing someone else's words or data as a source, common in academic writing and programming. It differs from 引 (yǐn), which is broader (to lead, attract, or cite as evidence), and from 参考 (cān kǎo) 'to consult/refer to', which means looking at a source for guidance, not reproducing it. 推荐 (tuī jiàn) 'to recommend' is about endorsing, not citing.