what is mpeg and ogg?

Answer 1

mpeg and ogg is another format of audio. You can use converter to convert mp3 into ogg or mpeg.

Answer 2

its different formats of audio, each format has its own quality and size,
you choose the best format for you depending on your own needs and resources.
e.g oog is smaller in size but mp3 is better in quality
real deference between them -beside the size- is lot more complicated talking about bit rates and db+ and more blubbering about sound engineering stuff so stick with the easy short explanation above.

Answer 3

its the liter quality of an mp3 its a good format for the websites because doesn't take a lot of space