So here's what I found out:
An encoder is a device or programs that is used to encode or compress an Audio or a Video file so that it can be stored or transmitted.
WAV format is the format for storing sound in PC’s—can be used on all Windows software.
MP3 is another encoder that has 3 layers—that has the best resolution. It also removes sounds that we cannot even hear!
Unless the MP3 was chosen because it may have the better resolution.
I will be curious to see if all the kids will be able to open and play the podcast!