When do you use the word hello?

You use the word "hello" in a variety of situations, most commonly as a greeting. Here are some examples:

Formal situations:

* Answering the phone: "Hello?"

* Meeting someone for the first time: "Hello, it's nice to meet you."

* Greeting someone you know: "Hello, how are you?"

Informal situations:

* Greeting someone you know well: "Hello!"

* Starting a conversation: "Hello, what's up?"

* Getting someone's attention: "Hello? Can you hear me?"

Other uses:

* Expressing surprise: "Hello! That's amazing!"

* Answering a question: "Hello, I'm here."

* As a filler word: "Hello, um, what was I saying?"

Essentially, "hello" is a versatile word used to initiate contact, express greeting, or simply acknowledge someone's presence.