Which Docker feature allows you to persist data generated by a container?

The feature that allows you to persist data generated by a container is volumes. In Docker, containers are ephemeral, meaning that the data stored within them is lost when the container is removed or stopped. Volumes provide a mechanism to store data outside of the container's filesystem, ensuring that it remains intact even if the container itself is deleted or recreated.

Volumes are specifically designed for data persistence, enabling you to keep your application data safe and accessible. When you create a volume, it is stored in a part of the host filesystem which is managed by Docker. This allows multiple containers to share the same data or for data to be retained when a container is updated or recreated, facilitating smoother development and deployment processes.

In contrast, images represent the static templates used to create containers, networks facilitate communication between containers, and while containers can contain data, their non-persistent nature makes them unsuitable for data preservation. Therefore, volumes are the correct choice for managing persistent storage in Docker.