The three different layers are, namely, the perception, network, and application layers.
The perception layer is the physical layer, which incorporates sensors for sensing and gathering information about the environment. It senses some physical parameters or recognizes other smart objects in the environment.
The network layer is accountable for correlating to other smart things, network devices, and servers. Its characteristics are also used for transmitting and processing sensor data.
The application layer is effective for delivering application-specific services to the user. It defines various applications in which the IoT services can be deployed, for example, smart homes, smart cities, and smart health.