In general, a web is an unstructured client/server network that uses HTTP as its transaction protocol.
The World Wide Web comprises all HTTP nodes
on the public Internet. An internal web comprises all HTTP nodes on a private network, such as an organization's LAN or WAN. If the organization is a corporation, the internal web is also a corporate web. If a corporate web connects two or more trading partners, it is often referred to as a business-to-business web, or an extranet.
Note that internal webs - also known as intranets - are only logically "internal" to an organization.
Physically they can span the globe, as long as access is limited to a defined community of interest.
Nomenclature: Throughout Intranet Journal the convention is used that the first letter of the word "Web" is capitalized only when referring to the World Wide Web.
Webs on private networks are referred to as "webs," with a lowercase "w".