以便: so that, in order to
连词 / conjunctions
Tone colorsā tone 1á tone 2ǎ tone 3à tone 4a neutral
Action，以便 + purpose (making it easier)
以便 introduces the purpose of an action, with the idea of making something easier: "so that", "in order to". Written register (instructions, notices, reports).
It opens the second clause. It's the logical opposite of 以免: 以便 + what you want to make possible; 以免 + what you want to avoid.
Examples
请保存好您的数据，以便日后查询。
Qǐng bǎocún hǎo nín de shùjù, yǐbiàn rìhòu cháxún.Please keep your data so it can be consulted later.
研究人员公开了代码，以便其他人检验结果。
Yánjiū rényuán gōngkāi le dàimǎ, yǐbiàn qítā rén jiǎnyàn jiéguǒ.The researchers released the code so that others could verify the results.
系统每天自动备份，以便出现故障时迅速恢复。
Xìtǒng měi tiān zìdòng bèifèn, yǐbiàn chūxiàn gùzhàng shí xùnsù huīfù.The system backs up daily so it can be restored quickly after a failure.
Common mistakes
✗ 以便 + an outcome to avoid: ✗ 早点出发，以便迟到 → ✓ 以免迟到。
✗ 以便 sentence-initially: ✗ 以便查询，请保存 → ✓ 请保存…，以便查询 (or ✓ 为了便于查询，请…).