Much like a corporate Intranet and Extranet is a regional network-accessible to companies or particular external customers, but unavailable for the public.The extranet may simply show data he or she’s fortunate to determine or just allow use of particular parts of the extranet though a person might have use of an extranet.

During the late 1990s and early 2000s, several industries started to use the term ‘extranet’ to describe centralized repositories of shared data (and supporting applications) made accessible via the web only to authorized members of particular work groups – for example, geographically dispersed, multi-company project teams. Some applications are offered on a software as a service (SaaS) basis.

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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.