Which term refers to communication established between devices?

The term that best refers to communication established between devices is "Protocol." A protocol defines the rules, formats, and conventions for data exchange between devices, ensuring that they can understand each other and communicate effectively. Protocols dictate how messages are formatted, transmitted, and processed, which is essential for networked systems.

While handshaking is a specific type of communication process involving the exchange of signals to establish a connection between devices before actual data transmission occurs, it is not a general term that encompasses all forms of device communication. Feedback refers to information sent back to the source regarding the effect of its transmission, and synchronization refers to the coordination of events or operations in time between devices, neither of which captures the broader definition of communication protocols. Thus, referring specifically to the rules and conventions guiding communication, "protocol" is the most accurate term in this context.