I think that homeopathy relies on the placebo effect. When you take those pills you think that you are already healed because you have taken your "medicine''. However, this practice is rather ineffective with some people, for example me. Even if I do not know that the particular drug is homeopathic, it will not help me unless it contains medically active substance.
I watched the woman in the video an I stopped it immediately after I heard the words ''with homeopathy we create an energetic substance''. Homeopathic drugs are so diluted that the real chemical in them is less than that in a glass of drinkable water. So it would mean that from whatever you are sick the best remedy for you is to drink some water.
So if you ask me to give a definition of homeopathy I will say: a placebo pill made from sucrose, lactose and other additional substances which does not have a proven healing effect.