An interjection is a word or phrase used to express strong emotions or feelings. Interjections are often used to convey surprise, excitement, joy, anger, or pain. They are usually followed by an exclamation point in writing.
Examples of interjections include: Wow!, Ouch!, Hey!, Hooray!, Oh no!, and Alas!
Interjections do not have a grammatical relationship to the other words in a sentence, and they do not serve a specific grammatical function. Instead, they provide an emotional emphasis or reaction to what is being said.
Interjections are important in English because they allow us to convey emotions and reactions in a quick and direct way. They add emphasis and energy to our speech and writing, and they can help to convey the tone and mood of a conversation or written text. However, it's important to use interjections appropriately, as too many or too frequent interjections can be distracting and make the speaker or writer seem less professional or credible.