Land mine
A land mine (called a "mine" when a naval mine is clearly not what is meant) is an explosive weapon that is put on the ground or just underneath the ground so that it explodes when a person or vehicle goes by. They are called "mines" because people who put them there often dig a tunnel under the ground (like miners who dig for coal etc.). Many people can be killed by mines, including civilians. Sometimes mines can lie in the ground and kill and injure people years after a war has ended.
There are different types of land mines. Big anti-vehicle mines are against vehicles. Smaller infantry mines are used against foot soldiers. Some mines leap into the air before exploding.
Land Mine Media
Examples of anti-personnel mines. Center: Valmara 69 (a bounding mine); right: VS-50
Swedish FFV 028 anti-tank-mines of the German Bundeswehr (inert versions)
Chinese illustration of a land mine with eight explosive charges, from the Huolongjing, 14th century
A "self-tripped trespass land mine" from the Wubei Zhi, 1621
Cutaway diagram of the S-mine
The Schü-mine 42, the most common mine used in the Second World War
Claymore mine with firing device and electric blasting cap assembly
Section of an anti-tank mine. Note the yellow main charge wrapped around a red booster charge, and the secondary fuze well on the side of the mine designed for an anti-handling device.