Amazon DynamoDB
Amazon's managed NoSQL — key-value + document, schemaless, autoscaling. Built 2007 internally (for the shopping cart), public 2012.
Inspiration paper: Amazon Dynamo paper (2007), classic. Pricing model: provisioned throughput or on-demand. Single-table design is the AWS-recommended pattern (one table, multiple entity types, careful sortkey design) — controversial but powerful. Global Tables for multi-region. DynamoDB Streams + Lambda for CDC. Competitors: MongoDB, Cassandra, ScyllaDB, FoundationDB. Hot partition is the infamous footgun.