利益 (lì yì) refers to benefit, interest, or gain—especially material or collective interests (e.g., personal interests, farmers' interests). It is more formal and broader than 好处 (hǎo chù), which is everyday and can mean a personal favor or advantage. Unlike 收益 (shōu yì) or 盈利 (yíng lì), which are specifically financial profit, 利益 covers both financial and non-financial advantages.