恩 (ēn) is a noun meaning 'kindness', 'favor', or 'grace' — the goodwill someone shows you, often with an expectation of gratitude. It appears in common compounds like 感恩 (gǎn'ēn, 'grateful') and 恩情 (ēnqíng, 'favor owed'). In sentences, you can say 对某人有恩 ('have done a kindness for someone') or 记得某人的恩 ('remember someone's kindness').