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Why Do We Need Protocols?

Protocol in computers is as a formal description of message formats and the rules two or more machines must follow to exchange those messages. Computers need protocols in order to avoid conflicts of data exchange and also for authentication.
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Popular Questions
Why do we still use separate protocols for Email instead of HTTP?
Different protocols are better for each application, so that the protocol so designed can properly express all the data and semantics required by the application. This question is an echo of the mania from about 30 years ago for Remote Procedure Call  www.quora.com
Why we use protocols for networking?
A protocol is a set of rules that governs the communications between computers on a network. These rules include guidelines that regulate the following characteristics of a network: access method, allowed physical topologies, types of cabling, and  answers.yahoo.com
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