Interjections are words or phrases that express strong emotions or sudden feelings. They are often used in conversation to convey excitement, surprise, or frustration. Common examples include "wow," "ouch," and "hey." Interjections can stand alone or be integrated into sentences, usually followed by an exclamation mark when conveying strong emotion. These words do not have a grammatical connection to other parts of a sentence, meaning they can appear anywhere. Interjections help to add color and personality to language, making communication more expressive. They are an important part of everyday speech and can also be found in written forms, such as in comic books or dialogue.