What was the significance of Alexander Graham Bell's invention of the telephone in revolutionizing communication and changing the way people greet each other over the phone?

Alexander Graham Bell's invention of the telephone revolutionized communication by allowing people to speak to each other over long distances in real-time. This changed the way people greeted each other over the phone by introducing the familiar "Hello" as a standard greeting, which Bell himself suggested. This simple greeting became widely adopted and remains a common way to answer the phone today.