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Rode is the preterit (past tense) form of ride Ridden is past participle, I think, but I may be wrong with the terminology.
Main difference, rode can stand alone as a verb, i.e. I rode my bike, or He/she/it rode the bus.
Ridden needs a form of have in front, i.e. I have/had ridden my bike, or he/she/it had ridden the bus.
I hope that helps