Formal:
* नमस्ते (Namaste): This is the most common and polite greeting, used for everyone, regardless of age or status. It literally translates to "I bow to you."
* शुभ प्रभात (Shubh Prabhat): This means "good morning" and is used in the morning.
* शुभ दोपहर (Shubh Dopahar): This means "good afternoon" and is used in the afternoon.
* शुभ संध्या (Shubh Sandhya): This means "good evening" and is used in the evening.
Informal:
* नमस्कार (Namaskar): This is a slightly less formal greeting than "namaste," but still very polite.
* काय हाल (Kay Haal): This means "how are you?" and is used as a greeting, especially with friends and family.
* सलाम (Salam): This is a more casual greeting, and is often used in areas with a Muslim population.
* हाय (Hi): This is the most informal greeting, and is often used with friends and family.
Other options:
* आपका स्वागत है (Aapka Swagat Hai): This means "welcome" and is used to greet someone when they arrive.
* कैसे हो (Kaise Ho): This means "how are you?" and is used as a greeting, especially with friends and family.
It's important to note that the most appropriate greeting will depend on the context. For example, you would use "namaste" when greeting a teacher, but you might use "hi" when greeting a friend.