Hello is an English word to greet someone. It is a word usually used in any conditions and to any age group of people. When meeting anyone (friends, family) or to start conversation with strangers, hello is the beginning word to start conservations.
Hello in Nepali = नमस्त
Pronunciation = Na-mastē

नमस्ते is a Nepali word for hello. You can say नमस्ते to greet someone in Nepali or to start a conversation. नमस्ते is most commonly used in Nepal, along with others countries like India and Pakistan.