Punctuation: commas (,)
We use commas to separate a list of similar words or phrases: …

Examples from literature

A comma is used whenever necessary to prevent ambiguity. 
Added comma missing in original after "hunting". 
The passage between commas is omitted in the representation, but we know not why. 
The subject of address is followed by a comma: "John, you are a good man." 
Whether they put the title in italics, or within commas, it is always italicised in this edition. 

comma | American Dictionary

comma
noun[ C ]
us/ˈkɑm·ə/
a mark (,) used in writing to separate parts of a sentence showing a slight pause, or to separate the various single items in a list

Examples of comma

comma
If teachers have ever told you, that you don't put a comma before that, they were right.
When a word or phrase is placed in inverted commas, it allows us a provisional use of it.
Their further decomposition, displayed below, is induced by the couniversal property of the comma construction.
In letters themes reports and the like use commas to separate items in a list.
When labelled constructor fields are used, braces, commas, field names, and equal signs are also used.
Parentheses may be omitted following the usual conventions regarding the precedence of operators and conjunction may be expressed with the comma operator instead.
Inferencing based on punctuation was limited to nouns, involving a few cases of capitalization (marking proper nouns) and commas (recognized as separating noun series).
We first change the semantics of the comma operator, by enforcing a sequence point between the (left-to-right) evaluation of the two operands.
My memory is that she changed one comma.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.