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Comma
Commas are used to indicate a pause or a change in thought. Commas keep words and ideas from running together, making writing easier to read. No other punctuation mark is more important to understand than the comma.
482.1 Between Items in a Series
Commas are used between words, phrases, or clauses in a series. (A series contains at least three items.)
Spanish, French, and German are all languages often taught in schools today, but Chinese, English, and Hindi are the languages spoken by the most people in the world. (words)
Being comfortable with technology, working well with others, and knowing another language and culture are important skills for today’s workers. (phrases)
482.2 To Keep Numbers Clear
Commas are used to separate the digits in a number in order to distinguish hundreds, thousands, millions, and so on.