A colon introduces an explanation and a semicolon connects two equally important parts of sentences. The use of a colon or a semicolon can change the meaning of a sentence.
Colons can be used in many ways: to introduce a list, to introduce an explanation, join together two main clauses that are closely related and they can also go before bullet points.
Semi-colons can be used break up lists and to also separate two independent main clauses that are closely related.
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