Workers KV is Cloudflare's distributed key-value store, designed for low-latency reads at the edge. It's perfect for caching, session storage, and simple data that doesn't require a full database.
KV organizes data into namespaces, each with its own read and write rates. Reads are eventual consistency by default—you might not see a write immediately across all edge locations, but it's fast. For stronger consistency, use the v2 API or consider D1 for transactional needs.
Performance-wise, KV excels at read-heavy workloads. Store configuration, user preferences, or cached API responses. Writes are rate-limited per namespace, so batch them when possible. Index patterns help—this isn't SQL, so plan your access patterns upfront.