A Ruby library for accessing the Amazon Web Services (AWS) APIs like: * Elastic Compute Cloud (EC2): provides resizable compute capacity via virtual machine set up and allocation. * Autoscaling: automatically scale your Amazon EC2 capacity up or down * Elastic Load Balancing (ELB): distributes application traffic across multiple Amazon EC2 instances * Relational Database Service (RDS): set up, operate, and scale MySQL instance * CloudWatch: provides monitoring for AWS like Amazon EC2.