* "I went to the store, bought some milk, and came home." This uses commas to separate items in a list.
* "The man, who was wearing a red hat, walked into the room." This uses commas to set off a non-essential clause.
* "My favorite foods are pizza, pasta, and ice cream, but I also enjoy a good salad." This combines both list and non-essential clause comma uses.
Remember: Commas are used to separate elements of a sentence and to clarify meaning.