A group, often named or numbered, to which items are assigned based on similarity or defined criteria. (noun)
A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative. (noun)
Examples of word category
Dates in the URL might look appropriate for a true Blog, but %category%/%postname% is far more user friendly, and many visitors will instinctively know to trim the URL to see the category home page.
Another question, how does WP chooses which category to use at %category%?
With respect to % category% not working in Apache 1. x, we got it working for 3 levels of category hierarchy by manually editing. htaccess and replacing the regexp where category would appear, namely
Add (New SqlParameter ( "@category", category)) command.
; '' '% category%' '': A sanitized version of the category name (category slug field on New/Edit Category panel).