Internet

An Internet is a global network for information and documents publishing in the Web form made available to the public.
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Intranet

An intranet is a private network within a small business, a company, an organisation or a corporation that works like a Website. An intranet enables company to share its resources with its employees without confidential information being made available to everyone as oppose to the Internet.
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Extranet

A global network uses both Internet to publish information to the public and Intranet for business partners or customers. It looks like a normal website but with password authentication to access the private section.
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Networking

Server Software

Internet Security

Resources

CIO - Intranet/Extranet Research Center
Intranet & Extranet resources

CIR - Complete Intranet Resources

CIR - Extranet Resources

Intranet FAQs

Intranet Publishing
Practical ideas to build a low-cost intranet

Intranet Road Map
Guide and tutorial for creating a corporate intranet

IntranetJournal
Tutorials, Scripts, Security, info management

JavaWorld - Welcome to the extranet

Microsoft TechNet - Intranet