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I dumped Windows 11 for Linux, and you should too
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From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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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.