more is a pager similar to
less but, as less is more, more is less. Its primary limitation is an inability to scroll backwards through pipes (though versions can scroll backwards through files with b or ^B). In almost any case,
less (which is probably the default pager, anyway) is the better tool to use.
This program is included because of historical precedent -- it has been present from the earliest days of UNIX.
Most (all?) Linux distributions incorporate this from the [util-linux] project.