What is the rel=canonical tag?

This blog is hosted in a bunch of places:

I prefer https://jameshfisher.com. The others are old, or insecure, or implementation details. To tell Google and everyone else which version you prefer, you can use the <meta rel="canonical" tag. On every page you serve, you put a <link rel="canonical" href="..."/> element, and this tells the client where the canonical location of that page is. Like so for the page /foo/bar:

<!doctype html>
    <link rel="canonical" href="https://jameshfisher.com/foo/bar"/>
  <!-- ... -->
I just released Vidrio, a free app for macOS and Windows to make your screen-sharing awesomely holographic. Vidrio shows your webcam video on your screen, just like a mirror. Then you just share or record your screen with Zoom, QuickTime, or any other app. Vidrio makes your presentations effortlessly engaging, showing your gestures, gazes, and expressions. #1 on Product Hunt. Available for macOS and Windows.

With Vidrio

With generic competitor

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