The Request-Response Model is a communication pattern in which one device sends a request and another replies with a response. This model is the basis of HTTP and many other client-server protocols. It provides structured, predictable interactions, which makes it easy to understand and implement. However, it is less efficient for scenarios where devices need continuous or asynchronous data exchange. In IoT, the request-response model is often used for configuration, querying data, or occasional updates. For streaming or event-driven systems, other models like publish-subscribe are usually preferred.