An IoT gateway, also known as a smart gateway, is a device that serves as an intermediary between IoT devices and the cloud or other network services. The IoT gateway collects data from connected devices and transmits it to cloud services or other backend systems for processing, analysis, and storage. It can also receive commands or instructions from the cloud and send them to the connected devices.

IoT gateways play a critical role in managing and processing the vast amounts of data generated by IoT devices. They can perform tasks such as data filtering, aggregation, and pre-processing, which can help to reduce network traffic and improve overall system performance. IoT gateways can also provide local analytics and decision-making capabilities, allowing for faster response times and reducing the need for round-trip communication with the cloud.

IoT gateways typically include a range of connectivity options, such as Wi-Fi, cellular, Bluetooth, and Zigbee, to enable communication with a wide range of devices. They may also include security features such as encryption, authentication, and access control to ensure that data is transmitted and stored securely.

IoT gateways are used in a wide range of applications, including industrial automation, smart cities, home automation, and healthcare. They can provide a centralized point of control for IoT networks, enabling organizations to manage and monitor their devices more effectively and efficiently.