Docker is an implementation of container technology, which is a lightweight version of VMs. It was originally built on Linux Containers (LXC), but now it supports many other technologies, including Windows. For the same server, you can run a greater number of containers than traditional VMs as they don't always include a full OS with every image, and they share many resources. For example, if you always use the official Microsoft image, then Docker will share this base between your .NET Core apps while still keeping them separated and sandboxed.
Containers can significantly reduce costs, both in hosting hardware and time saved not configuring and manually security patching the OS yourself. The .NET team saved ...
