What is a Qdrant collection and how is it structured?

A Qdrant collection is a named set of points where each point has a unique ID, one or more vectors, and an optional JSON payload. The collection has a fixed vector configuration including size, distance metric, and optional quantization settings that apply to every point. Collections are the main unit of sharding, replication, and access control. A single Qdrant cluster can hold many collections with different configurations, for example separate collections per tenant, per embedding model, or per data type like text, images, or audio.