Can Docker be considered a virtualization tool or is it still containerization?

Docker is a tool for containerization, not traditional virtualization.

Containerization isolates applications at the operating system level, using shared kernel resources, which makes containers lightweight and fast. Virtualization, on the other hand, creates full virtual machines with separate OS kernels, requiring more resources.

Docker packages the application and its dependencies into a container that can run in any environment, providing portability and isolation without the overhead of virtual machines.