TCP/IP is the fundamental suite of communication protocols for the internet and IoT networks. IP is responsible for addressing and routing packets between devices, while TCP ensures reliable, ordered delivery of data. This protocol stack provides a universal framework that enables devices of different types to communicate. It is robust and well-established, making it the backbone of most IoT communication. However, TCP/IP can introduce overhead, which is not always ideal for low-power IoT devices. Still, it remains the standard for ensuring interoperability across networks.