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

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I am using 34 size bra, bit confused with A, B and C size bra guide me which size will be bigger in B, C and D? - Quora

Is it better to wear a bra with slightly too big cups or slightly too small? For me, B is a little small, but C is a little big. Which one should

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Why do bra sizes go from D, DD, to DDD instead of just going from D, E, to F? - Quora

Why do bra sizes go from D, DD, to DDD instead of just going from D, E, to F? - Quora