Surfing around the Book of Face this morning, we come to this little graphic that explains the M18 Claymore Mine.
Of course, you can click it to embiggen it. The M18 Claymore mine entered the inventory in the late 1950s and has been in use ever since. It is a command-detonated anti personnel mine that can be used in a variety of ways to keep the enemy at a distance, to break up attacks, and to deny terrain to the bad guys. It can be employed single, or daisy-chained together. With a unit cost of $119 (1993 dollars) it is inexpensive, lightweight, and easily understood.
As a matter of fact, that graphic tells you just about everything you need to know.