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The default structure of a permalink uses the post ID as a unique identifier in the url: http://example.com/?p=23

To change the default URL structure (permalink) to something thats a bit more friendlier and more readable, go to Settings > Permalinks. There you should see a screen that looks something like the image below. In this example we've already chosen to use a "Custom Structure" but you can choose one of the other defaults available if you want.

Available Permalink Tags

If you've chosen to use a "Custom Structure" then there are some useful tags available to you:

• %year% = the year of the post (eg. 2010)
• %monthnum% = month of the year (eg. 08)
• %day% = day of the month (eg. 25)
• %hour% = hour of the day (eg. 16)
• %minute%  = minute of the hour (eg. 29)
• %second%  = second of the minute (eg. 12)
• %postname%  = post slug (post title)
• %post_id% = the ID of the post
• %category% = category slug of where the post is stored
• %author% = author name

You can use these tags to customize your permalink like the example in the above. Make sure to end your custom URL structure with either %post_id% or %postname% so WordPress has a unique identifier to point to. Here are some good examples of common, custom, permalink structures:

• /%category%/%postname% = yoursite.com/category/post-title
• /%post_id%/%postname% = yoursite.com/23/post-title
• /%year%/%postname% = yoursite.com/2010/post-title

Adding to your URLs

You can also add a string, including file extensions, to the end of the url as seen in the examples below:

• /%category%/%postname%/ = yoursite.com/category/post-title/ (forward slash added)
• /%category%/%postname%.html = yoursite.com/category/post-title.html
• /%category%/%postname%.php = yoursite.com/category/post-title.php

You can, technically, add anything to the end of the URL and WordPress will interpret it properly. This is useful if you are migrating from a static html site and you want to keep the old URL structure.

Categories & Tags

By default WordPress uses "category" and "tag" as the base name for the category and tag archives respectively. You can rename these under the permalink settings as well. A good example of why you might change these base names would be if your blog was all about cars. It would look a lot nicer if you changed the category base name to "car" and the tag base to "model". This way your category URL structure will look something like yoursite.com/car/category-slug and the tag URL structure would be yoursite.com/model/tag-slug. Here's what those settings would look like:

.htaccess File

What happens when you've set this all up but its not working? In most cases, you are probably missing the .htaccess file in the root of your WordPress install. Open up your FTP client, connect to your server and make sure that there's a .htaccess file and that it contains the following code:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Reference: for more information about WordPress permalinks, visit WordPress codex.