MongoDB

MongoDB is a leading NoSQL document database that stores data in flexible, JSON-like documents instead of rigid tables, letting developers model data the way their applications actually use it. This document model, combined with a rich query language, secondary indexes, and horizontal scaling via sharding, makes MongoDB a popular choice for modern applications where schemas evolve quickly and data is varied. Its managed cloud service, MongoDB Atlas, runs the database across AWS, Azure, and Google Cloud with automated provisioning, backups, scaling, and security. Atlas has grown into a broader developer data platform. Beyond the core database, it includes Atlas Search (full-text search built on Lucene), Atlas Vector Search for AI and semantic/RAG applications, Stream Processing, Data Federation, charts, and triggers — so teams can build search, analytics, and AI features on the same data without bolting on separate systems. Drivers for every major language, strong documentation, and a large community make it developer-friendly, and enterprise features cover encryption, fine-grained access, and compliance. MongoDB serves developers, startups, and enterprises building web, mobile, and AI applications. Atlas pricing is usage-based: a free tier (512 MB shared cluster), a Flex tier from about $8/month for variable workloads, dedicated clusters from about $57/month (M10 and up), and custom Enterprise, with search, backup, and data transfer billed as extra usage. It competes with PostgreSQL/managed Postgres (including Supabase), Amazon DynamoDB, Couchbase, and Firebase, differentiating on the document model plus its integrated search and vector capabilities.