The comma , The comma is the most frequently used mark of punctuation. Its primary function is to group words that belong together and to separate words that do not belong together. There are many functions for the comma.
Commas are like yield signs.
They do not require that a full stop be made, but a slow down or pause before we go on to the next item. I went to the store to buy a lemon , an apple , and a peach. If the item is used in pairs, do not use a comma. For breakfast I ate fried potatoes , coffee , toast , bacon and eggs , and pancakes. Do not use a comma if all items are connected by and or or .