The article discusses how everyday objects with wireless and computational capabilities are connected to the Internet, forming the Internet of Things (IoT). It explores how IoT is crucial for developing smart applications in various areas like cities, homes, health, factories, and more. The paper highlights the challenges in finding the right communication solutions for smart applications using IoT technology. It also describes the characteristics of different smart application environments and their corresponding IoT communication technologies. The research aims to show how IoT can be applied in real-life scenarios and identifies areas for further study.