Commonly spoken languages:
* English: Hello, Hi
* Spanish: Hola
* French: Bonjour (formal), Salut (informal)
* German: Hallo
* Italian: Ciao (informal), Buongiorno (formal)
* Portuguese: Olá
* Russian: Здравствуйте (Zdravstvuyte - formal), привет (privet - informal)
* Chinese (Mandarin): 你好 (nǐ hǎo)
* Japanese: こんにちは (konnichiwa)
* Korean: 안녕하세요 (annyeonghaseyo)
* Arabic: مرحبا (marhabaan)
* Hindi: नमस्ते (namaste)
* Turkish: Merhaba
Less common languages:
* Dutch: Hallo
* Swedish: Hej
* Finnish: Hei
* Danish: Hej
* Norwegian: Hei
* Polish: Cześć (informal), Dzień dobry (formal)
* Hungarian: Szia (informal), Jó napot (formal)
* Czech: Ahoj (informal), Dobrý den (formal)
* Greek: γειά σου (ya sou)
* Vietnamese: Xin chào
* Thai: สวัสดี (sa-wat-dee)
* Indonesian: Halo
Note: The formality of "hello" can vary depending on the language and the context. Some languages have separate greetings for different times of day (e.g., "good morning," "good afternoon," "good evening"). It's always a good idea to learn the appropriate greeting for the situation.