Grounding mats are also known as "earthing mats" and are used by adherents to the practice of "earthing." They are advertised as improving the human body's electrical connection to the ground.
These mats supposedly help to cure chronic inflammation and improve overall health. They often come with a pad and are plugged into a wall outlet. Electrical discharge from the body is purportedly conducted from the pad or mat to the ground pin of the plug and discharged. Proponents of earthing claim this helps to treat many different medical conditions.
As of March 2015 there is very little scientific evidence to support earthing as a legitimate phenomenon.