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Exchange to exchange (E2E), in the context of IT, is the interaction between websites and the businesses that operate them. Certain kinds of transactions called "exchanges" between websites constitute what IT professionals could call an "exchange to exchange" operation.
It’s important to note that the meaning of E2E in information technology is related to the perception of a website as an exchange—a platform for exchanging goods, services or values. For example, if a certain website is a resource for buyers and sellers of a commodity, and that website is linked to another site that processes transactions, user activity that is linked between the two sites could be seen as an E2E interaction.
Although E2E can mean "exchange to exchange," it has also been used to represent the term "end to end." The end-to-end principle in IT involves the placement of certain software functions in a network’s end hosts, rather than in other network segments. For this reason, those talking about E2E should be careful to provide context and show which of these two ideas they are talking about when discussing IT implementation of E2E solutions.