An interjection is a word used to add emotions. Interjections involve the use of sounds which do not commonly occur in English. They usually end in an exclamation mark.
They may be whole sentences or phrases, such as, Out with it! Keep calm! What a day! Good gracious! Oh dear! But more often, they are sounds which are often difficult even to spell: Ugh! Whew! Psst! Nyuk! Bravo! Hurray! Alas! Gosh! Pheux!
You may find some of these interjections useful when writing direct speech as in dialogues and compositions.
Some interjections and their meanings are shown in the following examples: