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The OSI reference model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980's.Hence the interchangeable terms OSI/ISO Reference Model. This model describes the principles for interconnection of computer systems in an Open System Interconnection environment. So, it is an idealized model of the logical connections that must occur in order for network communication.Most protocol suites, such as TCP/IP, DECnet, and Systems Network Architecture (SNA), map loosely to the OSI reference model. The OSI model is not a protocol but it is good for understanding how various protocols within a protocol suite function and interact. But what does it really mean"Open System Interconnection"? The general principle which leads to the definition of the OSI standard was to allow connection and communication between any computer systems(from any vendors) as long as they comply with this"OPEN"standard.
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OSI参考模型，有时也称作ISO或者7层通信参考模型，是在20世纪80年代初由国际标准化组织开发的。因此，还可称作OSI/ISO参考模型。这个模型描述了在开放系统互联环境中计算机系统互联的若干原则。因此，它是一个适合于网络通信的理想的逻辑连接模型。许多协议簇，如TCP/IP、DECnet和系统网络体系结构（SNA），都不太严格地映射为OSI参考模型。OSI模型不是一个协议，但是它有助于理解一个协议簇中的各种协议是如何运行和相互作用的。"开放系统互接"真正意味着什么呢？OSI标准定义的总体原则是只要它们遵守这个"开放"标准，任何计算机系统（来源于任何厂商）之间都可以进行连接和通信。
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