hi,
A regular mux/demux expects digital inputs/outputs, say 0V/5V for a TTL signal.
The 4067 is a analog mux/demux, its inputs can vary from 0V thru +Vs, where +Vs is the supply to the 4067.
It can also work with -V and +V supply voltages.
So with a 4067 you could select and control for example audio or video signals
EDIT:
Its also bi-directional for the analog inps/outs
i am trying to build a score board and using multiplexing method I can run 16 seven segments
but I need to activate my 7segments(common cathode) by drawing power by NPN transistors.
all the base pins from transistor am trying to connect to HEF4067 and using only 4pins from PIC
i am planing to do this task.