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The R4 is a Flascard for the Nintendo DS handheld system. It is now banned in most countries because of lawsuits from Nintendo.
Flashcards are cards made to play ROMs. This allows the user to have multiple games on one card, or play games that they did not pay for.
There isn't a real R4 Series because the manufacturer of the R4 stopped producing them, but there are other cards that are of similar quality made by other companies (and thus are clones).
There is only 1 original R4 card lineup, however they are out of production.