is a container? ➤ Stand-alone executable package of software with everything you need to run it: code, runtime, tools, libraries, settings, etc. ➤ Sounds like a Virtual Machine… ➤ VM has a complete guest operating system, containers don’t have log in or other unnecessary parts of OS ➤ Containers can pack a lot more apps into a single server than a VM can ➤ VM better for running unknown code - it can only mess up the VM OS, not your OS