Container Instances are an AWS offering that provides a way to quickly create, deploy and manage containers in the cloud. With Container Instances, you can define your application requirements in terms of CPU and memory, then launch containers with those specifications. You can also choose from a variety of container images available on the AWS Marketplace or build your own custom images. Container Instances provide a simple, secure way to run applications without having to worry about managing infrastructure or configuring servers. They are designed for rapid deployment of containerized applications and provide high scalability with minimal effort.