The “slug” is the URL-friendly version of the name. It is usually all lower case and contains only letters, numbers, and hyphens. The “slug” is the URL-friendly version of the name. It is usually all lower case and contains only letters, numbers, and hyphens. The “slug” is the URL-friendly version of the name. It is usually all lower case and contains only letters, numbers, and hyphens. The “slug” is the URL-friendly version of the name. It is usually all lower case and contains only letters, numbers, and hyphens.