Anyone holding the link can read your campaign wiki. Open World, select the globe beside the search box, and select the Public link to copy it.
Check what is on it first
Three controls decide what leaves your campaign.
The eye at the top of a world entry holds that page back until you are ready. A DM notes block hides one passage while the rest of the page stays shared, and it is removed on the server before a player receives it. A session recap appears only once you make that session public.
Read your own wiki as a visitor before you send the link. It is the quickest way to catch a page you meant to keep back.
When a player needs an account
Reading needs nothing at all. A player signs in only to claim a character, keep their own character page up to date, or read a private note you have shared with them.
For that flow, see Invite a player to claim a character.
Share one recap instead
A single session can be shared on its own link, without the wiki being involved at all. See Share a session summary.
To set the wiki up, choose its featured panel, or change its colours and fonts, see Set up your campaign wiki.