A greeting or expression of goodwill.

नमस्ते

English Usage: "She gave me a cheerful hello as she walked by."

Hindi Usage: "उसने चलते हुए मुझे एक खुशहाल नमस्ते कहा।"

Used to express a greeting, typically when answering the phone.

हाय

English Usage: "Hello! Is anyone there?"

Hindi Usage: "हाय! वहाँ कोई है?"

To greet someone with 'hello'.

नमस्ते करना

English Usage: "She loves to hello everyone she meets."

Hindi Usage: "उसे हर एक से नमस्ते करना बहुत पसंद है।"