Imagine you're a developer, writing a cool app for Linux servers. But some people run Ubuntu 20.04 on their servers. Others run 22.04. Others run an entirely different operating system such as Red Hat Enterprise Linux. So how do you make sure your app runs well on each operating system? Normally, developers make multiple versions of their app. One version that runs on older Ubuntu, one that runs on the newer Ubuntu, one that works with Red Hat Enterprise Linux, and so on. There need to be small adaptations to ensure the app is compatible with each operating system. This can be tedious.
This is a companion discussion topic for the original entry at https://kodekloud.com/blog/what-is-the-difference-between-docker-lxc-and-lxd-containers/