When I was adding a tag to my question, I looked it up and found it doesn't have a wiki summary and navigated to a page that says:
Tag wikis help introduce newcomers to the tag. They contain an overview of the topic defined by the tag, along with guidelines on its usage.
All registered users may propose new tag wikis.
(Note that if you have less than 20000 reputation, your tag wiki will be peer reviewed before it is published.)
How can I propose new tag wikis?