In this paper, we take a look into the world of communication protocols from the ones we have relied on for years like the Ethernet, to newer technologies made just for the Internet of Things (IoT), and even those that are just starting to emerge. As our need for faster, more reliable, secure, and energy-efficient communication keeps growing, these protocols have continued to evolve. We look at how they work, what they are built on, and how well they perform in real-world situations. Along the way, we break down their strengths, their drawbacks, and where they are best used. Our review spans a broad spectrum—from classic wired systems to wireless options like Wi-Fi and cellular networks, as well as industrial communication setups and cutting-edge technologies like Time-Sensitive Networking. We break down how these protocols compare in terms of speed, ease of implementation, and security, helping readers understand which ones are best suited for different needs and situations. Finally, we talk about the big questions researchers are still trying to answer, and where things might be headed especially when it comes to making systems smarter, more unified, and ready for future challenges like quantum-safe communication. This paper is meant to be a helpful guide for anyone researchers, engineers, or tech enthusiasts—trying to make sense of today’s complex communication landscape.