Formal:
* வணக்கம் (Vanakkam): This is the most common and polite greeting, used in formal settings. It literally means "greetings" but also functions as "hello" and "goodbye".
* நல்வரவு (Nalvaravu): This means "welcome" specifically and is used for welcoming someone to a place.
Informal:
* வாங்க (Vaanga): This means "come in" or "please come" and is a friendly way to welcome someone.
* சாரி (Saari): This means "welcome" and is a more casual and friendly way to greet someone.
Other options:
* நீங்க வந்ததுக்கு நன்றி (Neenga vandhathukku nanri): This means "thank you for coming" and is a polite way to express gratitude.
* இங்கே வந்ததுக்கு நன்றி (Inge vandhathukku nanri): This means "thank you for coming here" and is a specific way to welcome someone to a place.
Example:
* Formal: "நல்வரவு, இங்கே வந்ததுக்கு நன்றி" (Nalvaravu, inge vandhathukku nanri) - "Welcome, thank you for coming here."
* Informal: "வாங்க, சாரி" (Vaanga, Saari) - "Come in, welcome."
Remember that the best way to welcome someone in Tamil will depend on the context and your relationship with them.