The Laws of Similars (that which makes sick shall heal) principle of homeopathy is often compared to vaccination. Vaccines introduce a small amount of the weakened virus or bacterium related to disease into body in order to raise the body`s  immune response against that disease .However homeopathy is quite different because homeopathic remedies are extremely diluted and therefore no diseased material (biology or chemical ) is introduced in to the body.
Another fundamental different is that a homeopathic prescription is specific to that particular patient and stimulates the body`s immune system to be strengthen against all illness not just a single disease.