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Originally Posted by Halla
VBR stands for Variable Bit Rate and CBR for Constant Bit Rate.
I tried explain them a bit but try wikipedia if this is confusing lol :
on 192 CBR mp3 the bit rate always stays at 192 . on VBR mp3 the bit rate varies according to the mp3 , more sounds higher the bitrate. on the more silent parts of the mp3 the bit rate is lower. The idea behind VBR is to save in file sizes & and there are different quality VBR around. some are for example from 128 kbps ~ 224 kbps and some could be from 192 kbps ~ 320 kbps.
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Hehe I think that's very well-explained.
To add to that...VBR assigns the "right" amount of bitrate to each second of the song...so if at that second the music/sound is more complex/layered, it will have a higher bitrate to fit all the elements. In contrast, if that second is just some simple bit, the bitrate will be lower. The advantage of VBR is that it's resource efficient. As opposed to CBR, which you have the same bitrate to every second, including places where the music is simple or even silent, VBR corrects for that. Therefore the file size of VBR mp3s is usually smaller (compared to like, 320kbps).
I prefer VBR myself, just 'cause it's cool to see the bitrate go up & down while you listening to a song. xD (haha not)