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Commas are one of the most ubiquitous marks of punctuation; however, they are also often misused. While commas do help express the flow of a sentence, they are not breath marks. In general, commas are most often used to connect dependent (or subordinate) and independent (or main) clauses, to link phrases in a single sentence, and to set off additional information.

When to Use a Comma

Use a comma before a coordinating conjunction [and, but, or, nor, so, yet, and for] when the conjunction joins two independent clauses(an independent clause is a group of words that expresses a complete idea).

My sister had always been fascinated with dogs,