Formal:
* 您好 (nǐ hǎo): This is the most common and polite way to say "hello" in most situations.
* 你好 (nǐ hǎo): This is a slightly less formal version of "您好". It's still polite but can be used in more casual settings.
Informal:
* 嗨 (hāi): This is a very informal and casual way to say "hello", similar to "hi" in English.
* 喂 (wèi): This is used when answering the phone or to get someone's attention.
Other options:
* 早上好 (zǎo shàng hǎo): "Good morning"
* 下午好 (xià wǔ hǎo): "Good afternoon"
* 晚上好 (wǎn shàng hǎo): "Good evening"
The best translation of "hello" will depend on the specific context and your relationship with the person you are speaking to.