wenogodie2:
Please pardon my ignorance. I urgently need to know the difference between Catalytic converter and Muffler.

1) Are they different or do they do the same job.
Answer: They are different and does not perform the same job. Note that catalytic converter also aid the job of muffler but muffler can't perform the function of catalytic converter

2) Do they complement each other or they have nothing in common.
Answer: As stated in answer for question 1, catalytic converter compliment muffler. Please note that catalytic converter is part responsible for emissions control, while muffler is responsible for noise control from engine exhaust gas

Thanks in anticipation of your kind response.