1. a punctuation mark (,) used to separate words, phrases, or clauses in a sentence
2. a brief pause in speech or music

Examples

• Place a comma after each item in the list.
• The comma separates the introductory phrase from the main clause.
• She paused at the comma before continuing to read.
• Don’t forget the comma before the coordinating conjunction.
• The Oxford comma is optional in many style guides.
• His speech had natural commas between each point.
• The musician observed every comma in the musical score.