UX Writing Glossary
This glossary includes the essential terms and concepts of UX Writing, Content Design, and Strategic Product Writing — from foundational principles like microcopy and plain language to advanced concepts like Content Ops and GEO. Each entry includes an easy-to-understand definition, a real-world example, and practical context for applying the term in professional UX Writing work.
Terms are organized alphabetically and cross-referenced throughout. New entries are added regularly.
#
404 Error–
A 404 error page is the screen a user sees when they navigate to a URL that does not exist — because the page was moved, deleted, or the URL was mistyped. In UX Writing, a 404 page is an opportunity, not just a failure state: good 404 copy acknowledges what happened, avoids technical jargon, reflects brand voice, and gives users a clear path forward.
Example
“We can't find that page. It may have moved or no longer exists. Head back to the homepage or search for what you need.”
Note: Overly clever 404 copy (“Oops, you broke the internet!”) can feel dismissive when a user is genuinely frustrated. Balance brand personality with practical helpfulness.
See also: Happy Path, User Journey, Microcopy