An exclamation point is a punctuation mark. Simply said. You probably have known that forever.
However, as a copyeditor and proofreader. I have noticed that such devices are over used and improperly used. Depending on the context of a sentence through the voice of a certain work or certain type of writing, exclamation points are brief when showing emotion “indicating a forceful utterance or strong feeling.” https://www.merriam-webster.com/dictionary/exclamation%20point.
An occasional emotional writer or three have used this punctuation mark after every sentence – yes, every sentence – and such a document is boring to read. Don’t do what they did. I understand and appreciate the emotions in a text or a manuscript, however, its overuse is unnecessary. Be wary and careful. Use it briefly. Briefly is the key word – to express feelings of excitement, happiness, announcements, group attention grabbers.
Here are some good examples:
Ahem! Amen! Bravo! Cheerio! Hallelujah! Here-Here! Hold It! Hooray! Wowee! Wonderful! Yikes! Yeah! Yippee!