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An '''internet service provider''' (ISP) is a company who provides customers with access to the [[internet|World Wide Web]]. There are many varieties of internet service providers, some focusing on consumers, businesses (small, mid cap, large), government organizations, non-profit organizations, educational institutions, and/or other ISPs. ISPs may offer access via [[DSL]], [[cable modem]], [[dialup]], [[fiber optic network]], [[cellular]], [[satellite]], or [[power line communications]] among others. If an ISP is not itself a tier 1 provider, then it must lease connections through another provider to connect to outside networks. Most of the tier 1 providers are telephone companies such as [[AT&T]].

An '''internet service provider''' (ISP) is a company who provides customers with access to the [[internet|World Wide Web]]. There are many varieties of internet service providers, some focusing on consumers, businesses (small, mid cap, large), government organizations, non-profit organizations, educational institutions, and/or other ISPs. ISPs may offer access via DSL, cable modem, dialup, fiber optic network, cellular, [[satellite]], or power line communications among others. ISPs need a connection to the Internet trunk line in order to provide their customers with internet access. ISPs connected directly to the trunk line are considered tier 1 providers.  If an ISP is not itself a tier 1 provider, then it must lease connections through another provider (which does have a connection to the trunk line) to connect to outside networks. Most of the tier 1 providers are telephone companies. The tier 1 ISPs in the US are:

*[[AT&T]]

<ref>https://www.reference.com/technology/list-tier-1-internet-providers-f18ded016b1a7dff</ref><ref>http://drpeering.net/FAQ/Who-are-the-Tier-1-ISPs.php</ref>

==See also==

==See also==

* [[AT&T]]

* [[AT&T]]

* [[Monopoly]]

* [[Monopoly]]

[[Category:Internet]]

[[Category:Internet]]

[[Category:Information Technology]]

[[Category:Information Technology]]