What is Qdrant and what is it used for?

Qdrant is an open-source vector database and similarity search engine written in Rust, designed for high-performance production workloads with rich filtering and payload support. It stores vectors with arbitrary JSON payload and indexes both for fast combined vector plus filter queries. Qdrant supports HNSW indexing, scalar, product, and binary quantization, on-disk storage, sharding, and replication. It runs as self-hosted open source, Qdrant Cloud managed service, or Qdrant Hybrid Cloud where you run compute in your own infrastructure with managed control plane.