When your website frontend is **published**, it will be visible and accessible to everyone (visitors) that visit your school website address.\
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When it is **un-published**, the website frontend will only be visible and accessible to admins that are logged in (i same browser where they're logged-on), but not to the general website visitors. Website visitors will rather be redirected to your portal login page.\
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This could be useful while still working on the pages and contents of your website, with the plan to publish it when done - ensuring that your site is only accessible to the public when it's fully ready, while keeping it private for admins during development.