A trailing slash at the end of a URL refers to a directory, while the absence of a trailing slash refers to a specific page.
In general, it is considered best practice to use a trailing slash for directory URLs and to omit it for page URLs. This makes it clear to both users and search engines what type of resource the URL represents.
For example, consider the URL "https://www.example.com/docs/". This URL with a trailing slash represents a directory of documents, and the server might return a list of files in that directory. On the other hand, the URL "https://www.example.com/docs" without a trailing slash represents a specific document named "docs".
However, most modern web servers will handle URLs with and without trailing slashes interchangeably and redirect the user to the intended URL. This helps to ensure that users can access your site regardless of whether they include the trailing slash or not.
In conclusion, it is up to you whether you include the trailing slash or not, but using it consistently for directories and omitting it for pages can make your URLs more readable and informative.