A company that provides Internet access to its customers
The company that you connect to the internet through. eg. AOL, BT, Wanadoo.
A provider of Internet services. Most telecommunications operators are ISPs.
A company that allows customers to connect to the Internet and provides services such as web site hosting and email servers.
An organization that provides access to the Internet. Small ISPs provide service via modem and ISDN while the larger ones also offer private line hookups (T1, fractional T1, etc.).