A container packages an application together with everything it needs to run, such as libraries, runtime and settings, but shares the host's operating system kernel instead of including a whole operating system. Containers are therefore smaller and start faster than virtual machines (VMs), and the same container image runs the same way on a laptop and in Azure. Docker is the best-known container format and engine, and images are usually stored in a registry such as Azure Container Registry. Where a VM virtualizes the hardware, a container virtualizes the operating system. Azure offers several ways to run containers, from simplest to most controllable, plus serverless and web-hosting options, and the Microsoft Azure Fundamentals exam (AZ-900) asks you to pick the right one for a scenario.
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