Smart home devices communicate with each other using network protocols and communication standards such as Zigbee, Z-Wave, and Wi-Fi. These protocols enable seamless interaction between devices like thermostats, security cameras, and lights within a home network. By using a central hub or smart assistant, users can control multiple smart devices through a single interface, enhancing convenience and efficiency. Moreover, interoperability between devices fosters automation, allowing them to work together to create customized environments. This connectivity makes smart homes more intuitive and user-friendly.