

At its core, SystemD coordinates and launches all the services in your operating system. So, it is essential for the boot process, but also does scheduling, meaning you could run a backup script every night with it, for example.
That’s the simple answer. But in truth, SystemD is often criticized for doing too much, so it’s hard to describe what it really does. For example, you can also manage network interfaces via SystemD.
Kind of the goal of SystemD is to provide common plumbing which works the same across distros, so that when you configure your services or network interfaces etc. on Ubuntu, it works the same as on openSUSE or Arch or whatever.







There’s these “ontological arguments”, which are basically folks trying to prove the existence of a god by reasoning with pure logic, so without relying on evidence. And they all sound like that. 🫠
One of the classics goes roughly like this:
These arguments are also always funny, because the same logic can be used to “prove” all kinds of things. For example, a perfect island can exist, therefore it must exist. 🙃
As far as I can tell, the arguments don’t actually get better over time either, but rather just more convoluted, to make it less obvious how silly they are…
https://en.wikipedia.org/wiki/Ontological_argument