URL slug is the part of a website URL address that comes after the domain, directory or subdirectory and is used to identify a specific page or content.

For example, in the URL "https://myfreeonlinetools.com/html-compress-minify/" the "html-compress-minify" is the URL slug.

Here are some considerations regarding the importance of URL slugs for SEO:

Readability and User Experience: The user experience can be improved by using URL slugs that are descriptive, clear, and short. A page's content can be easily understood by visitors simply by looking at the URL. This may result in increased click-through rates.

Keywords in URL: There may be a slight SEO advantage to include pertinent keywords in the URL slug.

Use Hypens : When it comes to word separators in URLs, search engines typically favour hyphens.