ISP (Internet service providers) can be categorized as an organization that requires users to pay fees, if you want to connect a computer with internet. ISPs generally provide internet connections, e-mail and website facilities sometimes.
ISPs can be in various forms, can be based in the city where you live that offers access to appropriate areas of local calls, or in the form of a national ISP that provides local access numbers nationwide. You may also be connected to the Internet through commercial channels such as AOL's service. Given such connections, you can access the internet with interesting features offered online, such as chat and search the database.