listing
Separating words, phrases, and clauses that are listed out.
Addresses
777 Windy Road, Olathe, Kansas 66062
Dates
On July 4, 1776, the Declaration of Independence was signed.
Around Initials in names
Dr. Smith, M.D., is a good docter.
interjections
Commas go around interjects Unless an exclamation point is used !
Hey, it is nice see you again!
Uh-oh, I forgot to email her back.
Between Equal Adjectives
Separate adjectives that describe the same noun equally.