Updated URL slug is the part located at the very end of a URL that refers to a particular page or post on a website.

A URL slug also describes what the page or post is about in a few words; e.g. the title of a blog post. It's in an SEO-friendly format as each word in a URL slug is split by a dash -, so it's readable by both humans and URL crawlers.

A URL slug doesn't necessarily have to be only in English. It can be written in any languages.

Therefore, you can make use of it to optimize your website for SEO to rank better in search engines.