Informal greetings are casual ways people say hello to each other. They often reflect a friendly or relaxed atmosphere. Common examples include phrases like "Hey," "What's up?" or "Hi there." These greetings are typically used among friends, family, or acquaintances rather than in formal settings. In informal situations, body language and tone also play a significant role. A smile, wave, or nod can enhance the greeting. Informal greetings can vary by culture, with some regions having unique expressions or gestures. For instance, in American culture, a fist bump might be used among friends, while in Japanese culture, a bow is more common.