The Permalinks Settings control the look and feel of your URLs. You can access it via your Settings -> Permalinks page.
By default WordPress uses web URLs which have question marks and lots of numbers in them, however WordPress offers you the ability to create a custom URL structure for your permalinks and archives. This can improve the aesthetics, usability, and forward-compatibility of your links.
The most common choices for permalinks are listed in a block, with an option to customize your own.
A number of tags are available to get you started.
If you like, you may enter custom structures for your category and tag URLs here. For example, using
topics as your category base would make your category links like
http://example.org/topics/uncategorized/. If you leave these blank the defaults will be used.
Your permalink rules are automatically written to your .htaccess file. If WordPress cannot write to it (due to permissions) it will leave the following message: