An Interjection is a word put into a sentence to show some sudden feeling or emotion. Interjections do not refer to anything, but simply express the speaker’s emotion or wish. In grammatical terms, they occur in isolation as an exclamation, or are loosely added on to a sentence
Interjection has two types such as Mild Interjection and Strong Interjection.
Mild Interjection (Punctuated with Comma)
Strong Interjection (Punctuated with Exclamation point)
Use an exclamation point at the end of a sentence that shows a strong feeling such as surprise or fear. An exclamation point is used instead of a period. Notice that an exclamation point (!) is often used after interjections