Formal:
* شب بخیر (Shab bekheir): This is the most common and formal way to say goodnight. It literally translates to "night good."
Informal:
* شب خوش (Shab khoosh): This is a more informal way to say goodnight, meaning "good night."
* خواب خوش (Khab khoosh): This is a very common and friendly way to say goodnight, wishing someone "pleasant sleep."
Other options:
* شبتون بخیر (Shabetun bekheir): This is a more polite and respectful way to say goodnight to someone, meaning "your night good." This is usually used when addressing multiple people.
* شبتون خوش (Shabetun khoosh): This is a more informal way to say goodnight to multiple people, meaning "your night good."
* خداحافظ (Khodahafez): This means "goodbye" and can also be used to say goodnight in a casual setting.
The best way to choose the right greeting depends on your relationship with the person you are speaking to.