Amazon Aurora is a relational database offered as a service integrated in AWS's Relational Database Service. Based on the open source MySQL, it is a commercial database that claims to be compatible with MySQL and PostgreSQL while providing superior throughput. As a cloud service, Aurora promises high availability. The system is being actively maintained and updated by Amazon.
Aurora was announced on Nov. 12, 2014 in Amazon's re:Invent conference in Las Vegas. It's officially released and ready to use as a service in AWS on July 27, 2015 and replaced the original Amazon Relational Database Service's database engine. It has been actively maintained and updated since its release.