OSI (Open Systems Interconnection) represents the totality of protocol definitions and associated additional texts which provide international standardization of many aspects of computer-to-computer communication. In theory it extends from the lowest level of signalling techniques to high-level interactions in support of specific applications.
The work on OSI was initiated in the late 1970s, and came to a level of maturity in the late 1980s and early 1990s. At the time of writing this text, there are many OSI standards in place, and implementations of the more popular standards are available as commercial products. Wide-scale purchase and use of a wide-range of OSI products is still however not yet a reality, with the free Internet (TCP/IP-based) software still having the greater market share.
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