Metadata, by its very definition, is information about information. In the case of WordPress, it’s information associated with posts, users, comments and terms.

An example would be a Content Type called Products with a metadata field for price. This field would be stored in the postmeta table.

Given the many-to-one relationship of metadata in WordPress, your options are fairly limitless. You can have as many meta options as you wish, and you can store just about anything in there.

This chapter will discuss managing post metadata, creating custom meta boxes, and rendering post metadata.