Argo CD is a declarative continuous delivery tool that automates and manages application deployments across Kubernetes clusters by continuously monitoring both the live state of applications and their desired state defined in Git repositories. It enables organizations to maintain consistency and control over their infrastructure by automatically detecting and reconciling any differences between the desired configuration in Git and the actual deployed state. For example, a global financial services company using Argo CD can define their payment processing microservices architecture in Git, and Argo CD will automatically ensure that all regional deployment clusters maintain identical configurations, detect unauthorized changes, and roll back problematic deployments - reducing downtime risks and ensuring regulatory compliance across their payment infrastructure.