* Interjection: This is the most common usage, where "dude" expresses surprise, agreement, or a general exclamation. It's similar to saying "Wow!" or "Oh!"
* Example: "Dude, that was awesome!"
* Noun: It can be used as a noun to refer to a person, typically a male, especially a young man.
* Example: "That dude over there is wearing a really cool shirt."
* Informal Address: It can also be used as a term of address, similar to "friend" or "man."
* Example: "Hey dude, what's up?"
It's important to note that "dude" is considered informal and slang. Its usage may vary depending on context and region.