Nice contest probably for research purpose.
A placebo is anything that seems to be a "real" medical treatment -- but isn't. It could be a pill, a shot, or some other type of "fake" treatment.
The placebo effect is a pervasive phenomenon; in fact, it is part of the response to any active medical intervention. The placebo effect points to the importance of perception and the brain's role in physical health.
Common placebos include inert tablets (like sugar pills), vehicle infusions, sham surgery, and other procedures based on false information.
There are some conditions in which a placebo can produce results even when people know they are taking a placebo. Studies show that placebos can have an effect on conditions such as:
Depression
Pain
Sleep disorders
Irritable bowel syndrome
Menopause
Flagging you for plagiarism.
You shouldn't just copy things off the internet. Google what I wrote. The only search result will lead to this page. You know what you did.
Plagiarism alert - @cheetah