Interjections are words or phrases that express strong emotions or sudden feelings. They are often used in conversation to convey excitement, surprise, or even frustration. For example, when someone sees a cute puppy, they might exclaim, "Wow!" or "Oh my!" These words stand alone and are usually followed by an exclamation mark to emphasize the emotion. Interjections can also be used to grab attention or fill pauses in speech. Common examples include "Hey!" to call someone over or "Oops!" when a mistake is made. While they may not fit into traditional grammar rules, interjections add color and personality to our language and communication.