OpenBSD and FreeBSD are two operating systems that have unique features and differences. OpenBSD is a security-focused operating system that emphasizes cryptography, whereas FreeBSD is more geared towards performance and scalability. Both are free and open-source, but each has a distinct user base and target market.
> "what are the key differences between freebsd and linux?"
Linux evolved from Minix, FreeBSD evolved from BSD Unix
Linux does not provide jails, Linux uses a different filesystem format (EXT4, XFS, Btrfs) as opposed to UFS or ZFS on the BSDs.
Most Linux distros are not source distributions (Gentoo being one notable exception), whereas the BSDs are source distributions (you get all the source for the OS and build it on your own hardware).
Their process and threading models are different - their signal handling API is different
their driver models are different
their driver APIs are different
Linux uses GCC or Musl, BSDs use Clang to build.
Linux and BSD Unix are different in every way, except they are both POSIX compliant and are programmed in the C programing language, and most tools programmed in C that can compile on BSD can also compile on Linux and vice-versa because it is relatively simple to port code from one OS to the other, and so Linux and the BSDs have similar app ecosystems.
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