How to Fix WSL2 is not Installed Error | Docker WSL2 Installation | Docker WSL2 vs Hyper-V | Docker Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries and configuration files; they can communicate with each other through well-defined channels. WSL 2 is a major upgrade over the original version of WSL Microsoft introduced in 2017. More than a mere version bump, WSL 2 is faster, more versatile, and uses a real Linux kernel.Microsoft’s goal in creating WSL 2 is to boost performance. And the best way to do that? Add full system call compatibility, i.e. put a real Linux kernel at the heart of things.