Is Cloudant an SQL database?
Cloudant and its Apache CouchDB stable-mate are “NoSQL” databases—that is, they are schemaless JSON document stores. Unlike a traditional relational database, you don't need to define your schema before writing data to the database. Just post your JSON to the database and change your mind as often as you like!
What is IBM Cloudant used for?
What is IBM® Cloudant®? A fully managed, distributed database optimized for heavy workloads and fast-growing web and mobile apps, IBM Cloudant is available as an IBM Cloud® service with a 99.99% SLA.