Amazon RDS vs Azure Cosmos DB

Amazon Relational Database Service (RDS) is a managed database service from AWS that supports MySQL, PostgreSQL, MariaDB, Oracle, SQL Server, and Db2 engines. It automates hardware provisioning, database setup, patching, and backups with options for Multi-AZ deployments and read replicas.

Azure Cosmos DB is a globally distributed, multi-model database service by Microsoft offering single-digit millisecond latency and 99.999% availability SLA. It supports document, key-value, graph, and column-family data models with multiple API options.