A fraud scheme that has been running since the 1700's by which a guillible person is sold a substance, usually pure water, as a cure for various ailments. At its inception, an elaborate set of pseudoscientific/pseudoreligeous principles, as a basis for homeopathy, were developed as a smoke screen for the perpatrators to avoid prosecution by the state. Due to the fact that medical science was embryonic at the time, convincing con artists could put forth wild stories regarding how their wonder cures worked, and no credible establishment could contradict them.
The statement "like cures like" is often used, and is qualified by the reasoning that the more dilute a substance becomes, the more potent it becomes. Despite the rational, scientific age that we live in there are many people who, irrationally, believe in homeopathy. Sadly many people with dire health problems, desperate for hope, will spend all they have on a homeopathic cure which consists entirely of either water, sugar pills, or some other such placebo. All objective examinations of homeopathy quickly determine that it could only be a centuries-old get rich quick scheme, as there is no legitimate scientific or medical reasoning behind it.
Mary: I went to a Homeopath today to treat my herpes! He took some herbs, and diluted them with water unitl there wasn't a single atom of the herbs left, and then sold me an ounce of the water for only $200!
Mary's children: Mommy, will we eat today?
Mary: No dearie, mommy needs the grocery money for her homeopathy and the palm reader this month.
Essentially: Quacks. A pseudo-science based purely on anecdotal evidence. This field thrives purely because it is inimical to real science.
Do not be fooled by phrases such as: 'memory of water' as basis for the molecular basis of homeopathy's effectiveness. Such claims have been systematically discredited.
Homeopath: Hello, I'm a homeopath, I practice homeopathy.
You: Throw yourself in a fire, homeopath.
Medicine able to cure everything except actual illness.
Example: Chop a homeopaths leg off.
Cure that homeopathy!