Ài xīn literally means 'love heart'—combining 爱 (ài, 'love') and 心 (xīn, 'heart'). It refers not just to romantic or familial love, but more broadly to compassionate, selfless affection—especially as expressed through kindness, generosity, or care for others. In modern Chinese, it’s commonly used in charitable contexts, such as volunteer work, donations, or community service, where the emphasis is on warm-hearted concern rather than emotion alone.

The term carries a positive, uplifting connotation and appears frequently in public campaigns, school activities, and media coverage of humanitarian efforts. While it can describe an individual’s inner quality ('She has great ài xīn'), it’s often used attributively before nouns—e.g., 爱心活动 (àixīn huódòng, 'charity event') or 爱心人士 (àixīn rénshì, 'philanthropist'). Unlike the more personal 爱情 (àiqíng, 'romantic love'), ài xīn emphasizes action-oriented, socially engaged caring.