A picture of a Massive Air Ordanance Bomb (MOAB). This is one of the most powerful bombs in the world.
The English Wiktionary
has a dictionary definition (meanings of a word) for: bomb
A bomb is an explosive device that makes and lets out its energy very quickly and has a big shock wave. They have been used for centuries.
Most bombs do not contain more energy than ordinary fuel, except in the case of a nuclear weapon.
A bomb is usually some kind of container filled with explosive material that is designed to destroy things when it is set off. The word bomb comes from the Greek word βόμβος (bombas), an onomatopoeic term with almost the same meaning as "boom" in English.
Air forces send bombers to destroy enemy targets. Terrorists use bombs in suicide attacks. Explosive materials used in mining work the same way, but are usually not called bombs.