The blog post explains the concept of Docker volumes, which are used to persist data independently of a container's lifecycle, ensuring that important data, like databases, are not lost when containers are destroyed. Volumes exist outside the Union File System on the host filesystem, which prevents accidental deletion during container removal. Unlike containers, Docker does not automatically delete unused volumes, requiring manual intervention for deletion. This separation allows for the free creation and removal of containers without affecting the stored data. The post also mentions the ability to assign names to volumes for easier reference, as opposed to relying on automatically generated complex identifiers. The blog aims to clarify the function and management of volumes within Docker, and it encourages readers to reach out with any questions.