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{{wikipedia|MP3#Bit rate|Bit rate}}

The '''bit rate''' or '''bitrate''' of media measures the bits used to store the data per second (kilobits per second, kbit/s or kbps). It is formally defined as the product of (bits per sample) × (samples per second).

A '''constant bit rate''' or '''constant bitrate''' (CBR) is a bit rate that does not change.

A '''variable bit rate''' or '''variable bitrate''' (VBR) is a bit rate that varies depending upon the complexity of the data.

Some common bit rates for [[mp3]] files are 128 kbit/s (standard), 192 kbit/s (medium quality), 256 kbit/s (high quality) and 320 kbit/s (highest quality).<br>
A low bit rate (below about 128 kbps) makes for poor audio quality.

[[Category:Glossary]]