There are also fusion bombs like a hydrogen bomb. But they are set off by a fission bomb.
The GBU-43/B Massive Ordnance Air Blast (MOAB, commonly known as "Mother of All Bombs") is a large-yield bomb, developed for the United States military by Albert L. Weimorts, Jr. of the Air Force Research Laboratory. At the time of development, it was said to be the most powerful non-nuclear weapon in the American arsenal. The bomb is designed to be delivered by a C-130 Hercules, primarily the MC-130E Combat Talon I or MC-130H Combat Talon II variants.
The MOAB was first dropped in combat in the 13 April 2017 airstrike against an Islamic State of Iraq and the Levant – Khorasan Province (ISIS) tunnel complex in Achin District, Afghanistan.
During World War II, Royal Air Force Bomber Command used the Grand Slam, officially known as the "Bomb, Medium Capacity, 22,000 lb" 42 times. At 22,000 lbs total weight, these earthquake bombs were technically larger than the MOAB. However, half their weight was due to the cast iron casing necessary for penetrating the ground (up to 40 m) before exploding. The MOAB, in contrast, has a light 2,900 lb aluminum casing surrounding 18,700 lb (8,500 kg) of explosive Composition H-6 material.
The United States Air Force's T-12 Cloudmaker 44,000-pound demolition bomb (similar in design to the Grand Slam), developed after World War II, carried a heavier explosive charge than the MOAB, but was never used in combat.
In 2007, the Russian military announced that they had tested a thermobaric weapon nicknamed the "Father of All Bombs" ("FOAB"). The weapon is claimed to be four times as powerful as the MOAB, but its specifications are widely disputed.
The MOAB is the most powerful conventional bomb ever used in combat as measured by the weight of its explosive material. The explosive yield is comparable to that of the smallest tactical nuclear weapons, such as the Cold War-era American M-388 projectile fired by the portable Davy Crockett recoilless gun