Permalinks are the URLs to the individual posts. The URL to each post should be permanent, and never change — hence permalink. When you set up a wordpress blog the default permalink will look something like this http://example.com/?p=N, where N is the post id. WordPress catagories Default permlink as “Ugly”. 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.