Argo CD is built around the idea of using Git as the single source of truth for how your Kubernetes applications and environments should look - and then having a system that actively keeps them in sync with that declared state. In practice, when you change something in a Git repository (for example Helm values, a Kustomize overlay or plain YAML), Argo CD detects it and updates the cluster to match.

Beyond the core functionality, Argo CD supports multiple configuration and templating tools such as Helm and Kustomize, multi-cluster management, a built-in UI/CLI, RBAC and auditability for sync and runtime status. It also works well in composed environments - for example, you can use ApplicationSet to manage many apps or environments via patterns and templates, simplifying operations for larger organizations.

In short: if you work with Kubernetes and want a Git-centric, declarative CD pipeline, Argo CD is a strong tool to consider.