In WordPress, the post slug refers to the part of a web page’s address that appears after the domain name.
A simple WordPress slug example would be if you visited a blog post at www.example.com/blog-post, then “www.example.com” is the domain name, and “blog-post” is the post slug.
By default, the slug of any post you publish will be the same as the title, only lowercase and with dashes instead of spaces. For example, if you start a blog and write a post called “My First Blog Post”, then the default post slug would be “my-first-blog-post”.