Amazon DynamoDB is a fully managed, highly available, scalable, NoSQL database with support for both key-value and documents schemas. DynamoDB tables scale in both storage and throughput capacity dimensions – storage capacity is scaled automatically, throughput capacity manually or automatically.
Amazon ElastiCache is a fully managed, highly available, scalable, in-memory data store and cache and provides support for two popular open source engines, Redis and Memcached, and is protocol compliant with both. ElastiCache provides an easy migration path for those desiring a fully managed alternative to self-managed in-memory store/cache, often as easy as simply changing an application configuration setting. ElastiCache is a member of the AWS database family of services which also includes RDS, Redshift and DynamoDB.
Amazon SageMaker is an easy to use, fully managed machine learning service on AWS. SageMaker removes many of the barriers that have previously prevented developers from fully incorporating the benefits of machine learning in their applications. The specialized expertise and compute power that used to be required to utilize machine learning is built in to the SageMaker service
Amazon Neptune is a fully managed graph database service with built-in support for Property Graph and Resource Description Framework (RDF) models, and SPARQL and TinkerPop Gremlin query languages. With Neptune you can easily implement solutions for popular use cases in social networking, life sciences and IT operations. Pay-for-what-you-use pricing makes the AWS managed Neptune service an attractive alternative to self managing your own database cluster.