Explaining it in a few sentences seems impossible as the subject is so rich in itself. However, one can say that it is a method of self-defense, as its name suggests.
Its creator is Jean-Pierre Huillo and the method has existed for 20 years. He now uses Aikido techniques (created by Master Morihei Ueshiba) in a spirit of Self-Defense, self-protection, where, as in aikido, dodging takes precedence over parrying.
Aikido Self-Defense, he says, is the art of using diplomacy through the body. Or asking the body to be diplomatic in its movements to avoid clashes in conflicts. As popular imagery puts it so well, learning to smooth things over.
Aikido Self-Defense seeks efficiency as a practical method to get out of an aggression, but without opposing resistance to the opponent.