A big bomb can break open. 
A big bomb can break open in the air. 
Some small bombs hit tanks or trucks. Others can start big fires. Some even break power lines. 
These weapons can be very dangerous. Many small bombs do not pop. They stay on the ground for a long time.
These unexploded bombs can hurt people. They can hurt people even long after a war ends.
Because of this, many lands have a rule. This rule says these bombs are not allowed.
A cluster munition is a special type of weapon. It can be dropped from a plane or launched from the ground. 
Inside the main shell are many smaller parts. These are called submunitions or bomblets. A single shell can hold more than 2,000 of them. When the shell opens, it scatters these small bombs over a wide area. 
Different bomblets do different jobs. Some are made to destroy tanks. Others use fire to start big flames. Some even use fine wires to break power lines. 
These weapons can be very dangerous for people. Many bomblets do not explode right away. They stay on the ground like hidden traps. The failure rate can be over 40 percent. This means many small bombs stay live for a long time. They can hurt people long after a war is over.
Because of these risks, many nations follow a rule. This rule is called the Convention on Cluster Munitions. It bans the use and making of these weapons. As of 2022, 123 states have joined this agreement.
A cluster munition is a special kind of explosive weapon. It can be dropped from an airplane or launched from the ground. 

How do these weapons work? A basic cluster bomb has a hollow outer shell. Inside this shell, there can be two to over 2,000 bomblets. 

People have used these weapons for a long time. The first major one was the German SD-2, also called the Butterfly Bomb. This was used during World War II. During that war, cluster bombs were used in places like Tokyo and Kyushu. The United States, Russia, and Italy all developed this technology on their own. 
There are many different types of these weapons. Some use shaped charges to pierce the armor on tanks. Others are incendiary, which means they are made to start fires. 

These weapons pose a big risk to people. Many bomblets do not explode when they hit the ground. This failure rate can be as high as 40 percent. 
A cluster munition is a specialized explosive weapon designed for wide-area impact. These weapons are launched from the ground or dropped from aircraft. Instead of exploding in a single spot, they release many smaller explosives called submunitions or bomblets. 

The mechanism of a cluster munition relies on a large, hollow outer shell. This shell acts as a container for the smaller submunitions. Depending on the design, a single container can hold anywhere from two to over 2,000 bomblets. 

There are several distinct types of cluster munitions categorized by their intended effect. Anti-personnel munitions use explosive fragmentation to target infantry and unarmored equipment. Anti-tank munitions utilize shaped-charge warheads to pierce heavy armor. Some submunitions are multi-purpose, combining fragmentation and shaped charges in one unit. 

Technological development of these weapons has evolved significantly over time. The first major operational cluster bomb was the German SD-2, also known as the Butterfly Bomb, used in World War II. During that era, the United States, Russia, and Italy all developed similar technologies independently. 
History shows that cluster munitions have been used in many global conflicts. During the Vietnam War, the United States dropped 260 million bomblets on Laos between 1964 and 1973. This massive deployment had lasting consequences, as 80 million of those bomblets failed to explode. In the 1982 Falklands War, British Sea Harriers used BL755 cluster bombs against Argentinian positions. Other conflicts involving these weapons include the Soviet-Afghan War, the Western Sahara war, and the Nagorno-Karabakh wars. In Nagorno-Karabakh, the area remained off-limits for years due to contamination from unexploded ordnance.
The most significant issue with cluster munitions is the high rate of unexploded ordnance. When submunitions fail to detonate upon impact, they remain on the ground as dangerous hazards. The failure rate for these weapons ranges from two percent to over 40 percent. 
The Convention entered into force on August 1, 2010, becoming binding international law. As of February 10, 2022, 123 states have joined the Convention, consisting of 110 states parties and 13 signatories. 
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