Formal:
* 再见 (zàijiàn): This is the most common and versatile way to say goodbye. It literally means "see you again" and can be used in most situations.
* 告辞 (gàocí): This is a more formal way to say goodbye, usually used in business or official settings. It means "to take leave" or "to bid farewell."
* 别了 (biéle): This is a more poetic and sentimental way to say goodbye. It means "farewell."
Informal:
* 拜拜 (bài bài): This is a casual way to say goodbye, often used among friends and family. It's derived from "拜别 (bài bié)," which means "to take leave."
* 下次再见 (xià cì zàijiàn): This means "see you next time." It's a more specific way to say goodbye, implying that you'll see the person again soon.
Other options:
* 一路顺风 (yīlù shùnfēng): This means "have a smooth journey" and is often used when someone is leaving on a trip.
* 保重 (bǎozhòng): This means "take care of yourself." It's a caring way to say goodbye, especially when someone is not feeling well.
Ultimately, the best way to say goodbye in Chinese depends on the situation and your relationship with the person you are saying goodbye to.