Informal:
* Salut: This is the most common and casual greeting, similar to "hi" or "hey" in English.
* Coucou: This is a very informal and friendly greeting, often used with close friends or family.
* Yo: This is a very informal and slangy greeting, similar to "yo" in English.
Formal:
* Bonjour: This is the most common and formal greeting, used in all situations where you are addressing someone you don't know well or someone older than you. It's the equivalent of "good morning" or "hello" in English.
* Bonsoir: This is the formal greeting used in the evening and night, equivalent to "good evening" in English.
Other Options:
* Hey: You can also use "Hey" in French, although it's less common than "Salut".
* Salutations: This is a very formal and old-fashioned greeting, used in very formal situations.
Remember: When greeting someone in French, it's important to consider the context and the level of formality.