Permalink is URL structure for your website. Go to the Settings/Settings. In Permalink input box, you can write your own permalink structure. Each parameter of permalink should be separated by slash. For example: type/id.
Available Permalink Parameters
type: Post types. For example posts or image.
id: Post ID.
title: Post Title.
year: Year of the post from post add date.
month: Month of the post from post add date.
day: Day of the post from post add date.
Website without Permalink
You can leave the permalink input box empty. In that case, core get the values from URL parameters. For example, http://example.com/?i=1 showing a post (ID=1).
We strongly recommend to fill the permalink with proper values. It can make the URL more user and search engine friendly.
Pages
If permalink input box isn't empty, Posts with page type are available directly form page name. For example, if you have page with contact permalink title, the page will be available at http://example.com/contact.
Language Group and Languages
If you leave the permalink input box empty, core can get the language group from lg and language from l URL parameters. For example, http://example.com/?lg=int&l=en.
If you set a permalink, core knows the language group and language are after your domain name. For example:
http://example.com/int/en/ is referring to the int language group and English language.
http://example.com/en/ is referring to the English language.
http://example.com/int/fr/post/1/ is referring to the post (ID=1) inside int language group and French language.
You don't need to specify language group and language inside permalink input box.