AWS CodeDeploy is a fully managed deployment service that automates the process of deploying applications to various computing services, such as Amazon EC2, AWS Lambda, and on-premises servers. It helps developers release new features quickly and efficiently while minimizing downtime during updates. With AWS CodeDeploy, users can easily manage the deployment of their applications across multiple instances. The service supports various deployment strategies, including in-place and blue/green deployments, allowing teams to choose the best approach for their needs. This flexibility helps ensure that applications are delivered reliably and consistently.