Containerization: What are containers?

- [Instructor] Let's start by defining … what containers really are. … To do that, we need to look back at virtualization … and virtual machines. … Virtual machines enable having multiple operating systems … in a single set of hardware. … This has two main benefits. … First, effective resource allocation. … If two virtual machines share the same hardware, … each of them can take advantage … of the underutilized resources in the hardware. … And second benefit of virtual machines is isolation. … Applications running in separate virtual machines … do not have access to each other's data. … Containers take the idea of virtualization even further. … When virtual machines virtualize the hardware, … containers virtualize the operating system. … Compared to the virtual machines, … containers are more easily portable … and more resource-efficient. … Container images are typically … an order of magnitude smaller than virtual machine images. … A unit of isolation in virtual machines … is a virtual machine image. …