Serial Comma

Also known as Oxford Comma or Harvard Comma

• The serial comma, also known as Oxford comma or Harvard comma is the last comma appearing before the coordinating conjunctions ‘and’ and ‘or’ in a list of three or more items.

• Let’s look at an example.

• Let’s look at another example.

In sentence A, without the serial comma, it sounds like OAuth and OpenID Connect are two fine-grained access control protocols. But in sentence B, we use the serial comma to indicate that WSO2 Identity Server supports fine-grained access control protocols as well as OAuth and OpenID Connect.

• Let’s look at a few more examples.

Reference

• Writing Fundamentals Guide
• https://www.grammarly.com/blog/what-is-the-oxford-comma-and-why-do-people-care-so-much-about-it/
• https://www.grammarly.com/blog/comma-before-or