Let me start stating their differences by saying Jujitsu is the older of the two martial arts. According to history, jujitsu was first used by the old Japanese Samurai warriors. It is a complete system of fighting that includes the use of kicks, swordplay, punches, grappling, etc. in order to defeat the opponent. Judo, on the other hand, uses one of the techniques in jujitsu. It is a type of martial art whereby two fighters grapple, and both rely on their weight and force to win the fight.
Jujitsu is very complex, and it uses more techniques than Judo, in fact, Judo is safer compared to jujitsu. This is because part of the techniques used in jujitsu is that one can target and launch several attacks on the other person's organs and nerve centers. Jujitsu seems to be a dangerous martial art because it can be used during a real fight. In contrast, judo is used majorly in sport.