Principle 2 Operable · Guideline 2.4: Navigable
2.4.5 Multiple Ways
There is more than one way to find a page.
What this means in practice
Navigation plus search, or navigation plus sitemap. Pages that are a step in a process are exempt – a checkout page need not be reachable another way.
Normative wording
The binding text lives at the W3C. What you read here is our own faithful rendering – not a quotation.