Pretty good clear value proposition for sidecars, good intro:

> But why is the idea that a container can run next to another container so interesting and so deserving of a special name? Because the sidecar pattern provides something really powerful: a way of augmenting an application at runtime without requiring code changes, while running in the same operational and security context as the application itself. That statement is key to understanding the power of sidecars and, I think, the power of Kubernetes's pod model.