Docker and Kubernetes. Kubernetes and Docker.

Kubernetes has become the trending orchestration solution for containers. All big Cloud providers bet on it, and even in smaller companies, k8s (written that way as there are 8 letters between k and s) is what all the hip developers go for.
Docker is still used to build all the images, and they have made it to a commercial product used by many customers.
Kubernetes has focused on being an extensible and scalable framework, and is still growing fast; it has a credible reputation for managing data center scale with best possible control. In fact, control is IMHO the word that describes its nature best.
Docker has chosen to put user experience first: it provides rich functionality with sane defaults, but users don't have to think about it -- Docker simply and quickly does what you mean. User experience is (IMHO) Docker's core characteristics.