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Aikido is the only art that trains against resistance. Judo (at least in theory) is non-resistive: it's push when pulled, pull when pushed.
The heart of Judo training is randori where (again in theory) this theory of non-resistance is put into practice. Good Judo is the art of throwing a non-resisting opponent, he pushes you, you pull him over, etc.
Aikido, on the other hand, is at it's core about training the body to have immovable posture and to be enormously powerful. Aikidoka spend all their time attempting to throw progressively more statue-like people. Perversely, except in the extream lower levels, Aikidoka never truely have a non-resisting uke the way Judoka do in randori.
Even when an Aikidoka makes an energetic attack, if the attack is made correctly, ukes posture is never given up and still has to be broken by tori, not with uke's power, but with tori's e.g. the tenkan on irimi nage ura.