The description is not prominent by default, however some themes may show it. Actually, that would be themes like this one.

To add category descriptions, you need to go to your WordPress dashboard. Then click Manage > Categories. Click on the category name that you’d like to edit. Then, just enter your description.

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This is an example of a WordPress page, you could edit this to put information about yourself or your site so readers know where you are coming from. You can create as many pages like this one or sub-pages as you like and manage all of your content inside of WordPress.