Permalinks are the permanent URLs to individual pages and blog posts, as well as category and tag archives. Basically, a permalink is the web address used to link to your content that is permanent, and never changes — that’s why they’re called permalinks.
The WP Permalink Settings screen allows you to choose your default permalink structure. You can choose from common settings or create custom URL structures. By default, WP uses web URLs which have question marks and lots of numbers in them. You’ll probably want to change your permalinks here to another structure to improve the aesthetics, usability, and forward-compatibility of your links.
If you’d like more information on setting up your permalinks, click the Help tab at the top of the screen. Here’ you’ll get an overview of common settings and structures to help select your permalink structure.
