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FreeBSD is an operating system which focuses on features, speed, and stability.
It is the 'other' (non-hugging) opensource operating system you may have heard about while being a Linux user watching popular YouTubers
The “non hugging” thing is wrong btw, FreeBSD folks just want consent first (not a bad thing), the community is pretty good and generally less toxic than that of some Linux distro's
FreeBSD is different to Linux based operating systems as it's base is a combined kernel and userland developer by a core team, whereas Linux is a Kernel developed separately from and requires a userlannd (normally GNU, but others are used)