Landmines are explosive devices that are triggered when someone stands on them or a vehicle drives on them. An area that is studded with landmines is called a minefield. The mines are usually buried just under the ground so that people can't see them. They are used to keep people from going through an area during a war. The problem with landmines is, after a war is over there may be thousands of landmines still left in the ground, and noone knows exactly where they are. So they kill people when they go to start a farm, or children who are exploring. Even the process of removing them is extremely dangerous as they can explode at the slightest touch.