What is the role of communication protocol in iot?

Think of it like language. So many IoT devices are there. From different company. One sensor, one light bulb, one mobile app. They all must talk. The communication protocol is the main rule book for this talking.

It tells devices how to send data. How to understand data. It is like a common language for them. Also, protocol helps in making data safe. Like a secret code, so no one can steal information. Without good protocol, all devices will be confused. They cannot work together. So, it makes sure everything is working smoothly and securely in the IoT system. It is very very important for all devices to connect and share correctly.