Using punctuation effectively means that your reader can make sense of your writing, It can also help create a particular effect to give your writing depth.
Part of English LanguageSpelling, punctuation and grammar
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Three dots in a row are called ellipsis and can be used to signify that something is missing. It is mainly useful in dialogue. For example:
"I wonder…" said Harry.
The ellipsis suggests that Harry is thinking of something else.
Avoid using ellipsis to end sentences.
Use the semi-colon to link two connected clauses. For example:
I have lots of homework; I can’t go out tonight.