The access times can be a bit frustrating. It depends on your provider's equipment, the sites you are visiting and the equipment you are using. The WWW is a giant web structure. What a complicated diagram that would make. The web structure of the WWW refers to how all the web pages are linked to other web pages.
Links are the underlined colored words, or images, or areas on the page.
In general, you can recognize a link when your cursor changes shape over it. The writers of each page are free to link to any other web page out there. They do not need permission to do so. Each web page has some small number of links on it. It is a very rare page that has no links on it at all.