Understanding containers - Red Hat

https://www.redhat.com/en/topics/containers

Containers are a technology that allow applications to be packaged and isolated with their entire runtime environment. This makes it easier to maintain consistent behaviour and functionality while moving the contained application between environments (dev, test, production) and across public, private, hybrid cloud, and on-premise. Because they are lightweight and portable, containers provide opportunities for faster development and meeting business needs as they arise.