via kinsta.com => original post link
This article explains how to containerize a Next.js application with a Dockerfile for a customizable deployment. Alternatively, you can deploy a Next.js app to Kinsta using automatic deployment.
With Docker, we package an application, its environment, and its dependencies into an isolated container. A container consists of an application running in a Linux stripped-down version. A Docker image is the blueprint for a container, and the container is a running instance of an image.
To containerize an application, we use a declarative method through a Dockerfile. Docker reads and executes the scripts defined in this file to build and deploy your application.