Apache Druid is a high-performance, distributed analytics database designed for real-time ingestion and fast querying of large-scale data. It's optimized for time-series data and provides sub-second query performance for analytical workloads.
A Multi-Model Database (MMDB) is a database management system that supports multiple data models in a single backend. This contrasts with traditional databases that typically focus on a single data model (e.g., relational, document, graph). MMDBs address the challenges of polyglot persistence by providing a unified platform for handling diverse data types and use cases, reducing the complexity of managing multiple specialized databases.