Advantages:

1] It reduces ckt complexity and cost.

2] We can implement many combinations logic ckts using multiplexer.

3] It does not need K-maps and simplification.

4] On the advance level the ability of MUX to switch directed s/g can be extended to smter video. s/g, audio s/g, etc.

Disadvantages:

1] Added delays in switching ports.

2] Limitations on which ports can be used simultaneously.

3] Extra IO many require to control multiplexer.

4] Added delays in I/O signals propagating through the multiplexer.