GBU-43/B MOAB
The GBU-43/B MOAB is a thermobaric weapon, which means it's packed with a very fine explosive powder that gets ejected out of the bombshell when the bomb has reached its target. This fine powder then is ejected into a big cloud of powder, which mixes with the air, oxidizing the explosive powder. Then, the oxidized fuel mix gets ignited, producing a very large explosion. Thermobaric weapons carry only fuel instead of fuel and oxidizer, like other bombs do, since oxygen is already in the atmosphere. Only carrying fuel allows for a much bigger explosion with the same bomb size. Some thermobaric weapons are so powerful that they are similar to small nuclear weapons in terms of explosion size and intensity.