What is the difference between a permalink and a URL?
The permalink is the full URL you see – and use – for any given post, page or other pieces of content on your site. It's a permanent link, hence the name permalink. It could include your domain name (www.yoast.com) plus what's called a slug, the piece of the URL that comes after the domain name.
Do Permalinks affect SEO?
Permalinks mean permanent links and should stay so! Changing them can hurt your SEO and cause your rankings in search engines to drop. You'll also lose out on your referral traffic from people who've shared your content on social media. As well as all backlinks you've managed to get to your site.
Why does permalink not work in WordPress?
4 Reasons Why a Permalink Might be Broken
While restoring your backup files or during migrating WordPress to a different server or domain can result in a broken permalink. Once you have updated a plugin, there might be a compatibility issue resulting in a 404 error
source google