AWS Cloud9 combines c9.io’s most popular features with new capabilities enabled by AWS. The Cloud9 back-end is now re-built using Amazon EC2, AWS CloudFormation, and AWS Identity and Access Management (IAM). As a result, Cloud9 is more powerful, flexible, and secure than ever. Cloud9 development environments can now run on EC2 instances.
This gives you the flexibility to manage instance sizes, run Docker, and install additional softwares because you have full control over the EC2 instance. Additionally, the managed EC2 instances comes with a pre-authenticated AWS CLI (Command Line Interface), giving you easy access to AWS services.