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 (gào cí): This is a more formal way to say goodbye, used in situations where you are leaving a meeting or event.
* 慢走 (màn zǒu): This literally means "walk slowly" and is a polite way to say goodbye to someone who is leaving.
Informal:
* 拜拜 (bài bài): This is a very casual way to say goodbye, similar to "bye-bye" in English.
* 88 (bā bā): This is a slang term for goodbye, derived from the Chinese word for "eight" (八).
* 回头见 (huítóujiàn): This means "see you later" and is a more informal way to say goodbye than 再见.
Other phrases:
* 祝你一切顺利 (zhù nǐ yīqiè shùnlì): This means "I wish you all the best" and is a polite way to say goodbye.
* 下次见 (xià cì jiàn): This means "see you next time" and is a good way to say goodbye if you plan on seeing the person again.
Choosing the right phrase:
* Use 再见 in most situations, especially if you are unsure of the formality level.
* Use 告辞 in formal situations, such as leaving a meeting or event.
* Use 慢走 when someone is leaving.
* Use 拜拜, 88, or 回头见 in informal situations, with friends and family.
* Use 祝你一切顺利 or 下次见 if you want to be particularly polite.
It's also good to note that the tone of voice and body language can also affect how your goodbye is perceived. A friendly smile and a warm tone of voice can make even a simple "再见" sound more sincere.