信用 (xìnyòng) means 'trustworthiness' or 'credit' — the quality of being reliable, especially in business or financial contexts. It differs from 信誉 (xìnyù), which also means 'reputation for trustworthiness' but is broader and more formal; 信用 is more concrete and often used for financial credit (e.g., 信用卡 'credit card'). 信心 (xìnxīn) is 'confidence' in someone or something, not trustworthiness.