引荐 (yǐnjiàn) means to personally recommend a person, often for a job or connection, implying a personal endorsement or referral. It is more specific than 推荐 (tuījiàn), which can apply to products, ideas, or people in general. Unlike 引进 (yǐnjìn), which focuses on bringing in talent or technology from outside, 引荐 emphasizes the act of vouching for someone personally.