What is the difference between an A, B, C, D, DD and E cup bra

Xiushiren Womens Large Cup Lace Bra Underwired Sexy Bralette

You will get 6 pcs bras with 6 different colors as shown on image at one price. The cup is molded cup with full coverage with underwire. It is

Pack of 6 Pieces Women's Wired Basic Regular Padding Everyday Bras A/B/C/D/DD/DDD 44DD

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Why do bra sizes go from D, DD, to DDD instead of just going from

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What are the differences between a C, D and DD bra size? - Quora

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