What is the difference between Aikido and Jujitsu?

Japanese Jiujitsu is Aikido's Ancestor. Other styles of Jiujitsu are different, however the Japanese style which is the original style is a root of Aikido. Aikido was created so that you would not destroy your attacker, however jiujitsu is used in combat. The Samurai used techniques that look like Aikido, however it is just a form of Jiujitsu. What Morihei Ueshiba (the founder of Aikido) did was take techniques that he learned from Daito Ryu Jiujitsu and shortened them creating "Aikido". Aikido often talks about protecting your attacker. Ultimately you have the option to protect or destroy once you know techniques, it is up to the Aikidoka.