Formal:
* سلام (Salam): This is the most common and polite way to say hello. It literally means "peace" and is used in most situations.
* صبح بخیر (Sobh bekheir): This means "good morning" and is used in the mornings.
* عصر بخیر (Asr bekheir): This means "good afternoon" and is used in the afternoons.
* شب بخیر (Shab bekheir): This means "good evening" and is used in the evenings.
Informal:
* سلام (Salam): This is also used informally, but can be shortened to سلا (Sala):
* خوبید؟ (Khoobid?): This means "How are you?" and is a more informal way to greet someone.
* چطوری؟ (Chetori?): This also means "How are you?" and is even more informal than "خوبید؟"
Other options:
* درود (Dorood): This is a more poetic and traditional greeting, meaning "greetings."
* آقا/خانم (Aqa/Khanom): This is used to address someone, and can be used as a greeting in informal settings.
The best way to choose the right greeting is to consider the context and your relationship with the person you are greeting.