educate me on bras and boobs (educational, not crude)?

What do A B C D double-D mean? I've heard that they represent shape, i've heard they rep size. If it's shape, can you explain? If it's size, are there measurements for classifying or are they just arbitrary like S M L XL?

Some girls have their boobs bouncing when they walk, like really jiggling. If they are wearing tank tops that show some boobs, they bounce almost chaotically out of sync with every step. Is that because they are not wearing a bra? Or are they wearing bras, except it's not tight? Or may it's not a sports bra?
is A bigger than AA?
or was it the other way, DD bigger than D?

The number, if it's the measurement around, then it's possible to have a 36A which means fatter but smaller boobs and someone else with 32D which means thinner but bigger boobs?

But if 2 people are 32D and 36D, they both have about the same boob size?

32A 34A means...? the 2 breasts are of different sizes?
 
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