HashiCorp Consul enhances application resiliency by deploying applications within a service mesh, avoiding the need for additional infrastructure changes. By decentralizing networking responsibilities such as routing and failover using proxy sidecars like Envoy, Consul allows applications to dynamically adjust network behaviors without altering application code, thus increasing resilience. Chaos engineering, a methodology involving deliberate testing of an application's ability to withstand various failure scenarios, is used to validate and build confidence in the system's resilience. This process involves forming hypotheses about potential failure points, such as a backend service's ability to handle container failures, and running experiments to attempt to disprove these hypotheses. Successful navigation of chaos experiments, facilitated by Consul's dynamic traffic management, indicates a robust and resilient application architecture.