What is DNS Propagation and Why Does It Matter for Your Website?
https://sitesignal.quillnesty.com/posts/what-is-dns-propagation-and-why-does-it-matter-for-your-website
DNS propagation is the time it takes for your website's new IP address to spread across the internet after you change hosting or domain settings. It matters because until it's complete, some visitors may see your old site or an error page, causing confusion and lost traffic.