What is a communications protocol?

What is a communications protocol?  What is the relationship between communications protocols and IT infrastructure?

A communication protocol describes the rule for transmitting data blocks referred to as Protocol Data Unit (PDU) from one network node to another. Protocols are usually defined in a layered manner and they offer part or all of the services indicated

By the OSI reference model layer. IT infrastructure is the network, software, and hardware services and resources needed for the management, operation and existence of an IT environment enterprise. The relation between the IT infrastructure and the communication protocol is that the communication protocol plays a major role in determining the kind of IT infrastructure to be employed in a certain IT system

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