<World-Wide Web> A web site
that aims to be an entry point to the World-Wide Web
, typically offering a search engine
and/or links to useful pages, and possibly news or other services.
These services are usually provided for free in the hope that users will make the site their default home page
or at least visit it often.
Popular examples are Yahoo
Most portals on the Internet
exist to generate advertising income for their owners, others may be focused on a specific group of users and may be part of an intranet
Some may just concentrate on one particular subject, say technology or medicine, and are known as a vertical portals.