The exclamation mark is a punctuation used to express strong feelings or emotions. It is commonly used after interjections or exclamations.
It is one of the most misused punctuation marks in the English language. We tend to use exclamation marks more often than what is required.
The exclamation mark should be mainly used to demonstrate shock, surprise, anger or a raised voice. The following cases demonstrate correct usage of this punctuation.
Go away! I don’t want to talk to you!
In addition, the exclamation mark can also be used in very informal writing or to express irony, humour or sarcasm.