ThingsBoard is an open-source IoT platform for collecting data from connected devices, processing it, visualizing it, and managing the devices themselves. Devices connect over standard protocols including MQTT, CoAP, and HTTP, and ThingsBoard handles provisioning, authentication, and telemetry storage, then lets users build real-time dashboards from a large library of widgets to monitor sensors, control actuators, and share views with customers. A rule engine provides visual, node-based processing so incoming data can trigger alarms, transform values, call external systems, and route messages without custom code, and multi-tenancy and role-based access make it possible to run a single deployment serving many customer accounts, which suits companies building IoT products for their own clients. ThingsBoard can be self-hosted from its open-source community edition at no cost, run as a paid professional edition with additional features and support, or used as a managed cloud service. It scales from a single server to clusters handling millions of devices, and it is used across smart agriculture, energy monitoring, smart buildings, fleet tracking, and industrial applications. The open-source core plus paid professional and cloud tiers make it a common choice for teams that want control over their IoT stack.