Internet of Things (IoT) devices communicate in dozens of various ways, using many different protocols. That's because how they convey depends on what they're, where they're, what other devices and systems they have to speak to, and what they need to mention. There’s no single best protocol, which is actually the common "language" wont to route messages from one IoT device to a different. the correct choice always depends on the application’s specific needs. There also are constraints to be considered. what is the device’s power budget? What are the price limitations? What are the necessities for physical size, security, time to plug, geographic regions, and remote maintenance? during this article, we'll take a glance at the embedded components of an IoT communication system, and discuss how different needs and contexts determine the most effective solution for every use case.