Azure SQL Edge is an optimized relational database engine geared for IoT and IoT Edge deployments. It provides capabilities to create a high-performance data storage and processing layer for IoT applications and solutions. Azure SQL Edge provides capabilities to stream, process, and analyze relational and non-relational such as JSON, graph and time-series data, which makes it the right choice for a variety of modern IoT applications.
Azure SQL Edge supports two connected (as a module for Azure IoT Edge) and disconnected modes (as a standalone docker container or on a Kubernetes cluster).

Reference Materials
- Azure SQL Edge documentation
- Microsoft Learn: Design for Azure SQL Edge