Formal:
* Hello: "Olá" (pronounced oh-LAH) - This is the most common and versatile greeting.
* Welcome: "Bem-vindo" (pronounced behm-veen-doo) - This is used for a single person.
* Welcome: "Bem-vindos" (pronounced behm-veen-dooz) - This is used for multiple people.
Informal:
* Hello: "Oi" (pronounced oh-ee) - This is a very casual greeting, like "hi" in English.
* Welcome: "Seja bem-vindo" (pronounced say-zha behm-veen-doo) - This is used for a single person.
* Welcome: "Sejam bem-vindos" (pronounced say-zham behm-veen-dooz) - This is used for multiple people.
Other options:
* Hello: "Bom dia" (pronounced bohm djee-ah) - Good morning
* Hello: "Boa tarde" (pronounced bo-ah tahr-dzee) - Good afternoon
* Hello: "Boa noite" (pronounced bo-ah no-ee-tee) - Good evening/Good night
Important Note: Portuguese has two main dialects: Brazilian Portuguese and European Portuguese. While the greetings above are generally understood in both dialects, there are some slight pronunciation differences.
Let me know if you'd like to know more about Portuguese greetings!