Namespace

A namespace is a logical partition within a vector index that isolates a subset of vectors so queries are scoped to only that partition. Namespaces enable multi-tenant deployments where different users, projects, or data sources share a single vector database instance without cross-pollinating results. Pinecone popularized the term; other databases use collections or tenants for the same concept. Namespace-level isolation avoids the cost of spinning up separate indexes per tenant.