Simple Definition:

Homeopathy is a medical system that uses highly diluted substances to treat a variety of health conditions [conditions that affect the body]. Instead of directly targeting the symptoms, homeopathy stimulates the body’s natural healing ability [the body’s ability to get better on its own]. It is based on the idea that “like cures like,” meaning that a substance that can cause symptoms in a healthy person can be used to treat similar symptoms in a sick person.

Examples:

• A homeopathic remedy for a headache might be made from a highly diluted form of a substance that would normally cause headaches, like belladonna [a poisonous plant].
• Homeopathy might use a highly diluted form of onion to treat someone with watery eyes and a runny nose due to allergies.

Very Simple Definition:

Homeopathy is a type of medicine that helps the body heal itself. Homeopathy uses a tiny amount of a substance that normally creates an unwanted condition, in order to cure the same condition. For example, if you have a headache, a homeopathic doctor might give you a bit of water that has a tiny bit of a plant that can give headaches.