If you are familiar with FreeBSD, then the parallel answer to the others in this thread is that on FreeBSD there's the bootstrap pkg that you get in base and the pkg that's in the ports tree itself. It's not quite the same, but the general idea holds that there's a less featureful package installer in base and a more featureful one in the package system itself.

* https://man.freebsd.org/cgi/man.cgi?query=pkg&manpath=FreeBS...

* https://freshports.org/ports-mgmt/pkg/