How many bits of data are MP3's stored in?

I’m sort of new to this whole scene, but Is there a number to how many bits of data are MP3’s stored in? I heard that CD quality music files (WAV & CDA) are sampled 44,100 times each second, and then stored in 16 bits of data, and at 44.1 kHz, but what about MP3’s?

Have a read of this Wikipedia article:

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