Why Does Safari Say “Not Secure” for Some Webpages on iPhone, iPad, or Mac?
If you’re a Safari user who recently updated iOS or MacOS, you may occasionally run into a “Not Secure” message near the top of the screen when viewing some websites or while browsing the web.
That ‘Not Secure’ text is simply a notification from Safari that the webpage or website is using HTTP, rather than HTTPS. This is also reflected in the URL prefix of a website, for example https://osxdaily.com vs https://osxdaily.com