Resiliency in AWS cloud environments differs significantly from on-premises setups due to the division of responsibilities outlined in AWS's Shared Responsibility Model. While AWS ensures the reliability of its infrastructure and services, customers are tasked with maintaining the resilience of their deployed workloads, such as virtual machine clusters and network configurations. This model shifts the focus from hardware management to optimizing applications, leveraging AWS's service level agreements for reliability assurances, and utilizing tools like Auto-Scaling Groups to manage resources efficiently. The AWS Well-Architected Framework provides guidance for building resilient systems, emphasizing continuous testing and change management to adapt to the dynamic nature of cloud environments. Tools like Gremlin's Reliability Management platform can further aid in automating reliability practices, allowing teams to focus on delivering features while proactively addressing potential risks and ensuring system availability.