Node-RED is a low-code programming platform for building event-driven applications through a browser-based flow editor. Originally developed by IBM and now hosted under the OpenJS Foundation, it allows users to wire together hardware devices, APIs, and online services using a visual interface. Built on Node.js, Node-RED is widely used in smart agriculture, IoT, and automation setups to integrate sensors, perform data transformation, and trigger actions across systems. It supports a rich plugin ecosystem, MQTT and HTTP endpoints, and can be deployed from edge devices to the cloud.