An explosion is a sudden, violent release of energy that creates a powerful burst outward, often with a loud bang, bright flash, and expanding force. When something explodes, it releases all its energy at once instead of gradually, like the difference between slowly deflating a balloon and popping it.

Explosions happen in different ways. A firecracker explodes because chemicals inside react quickly, creating hot gases that expand faster than the firecracker can contain them. A balloon explodes when too much air pressure builds up inside. Even popcorn kernels explode when water inside them turns to steam and bursts through the hull.

Not all explosions involve fire or danger. Scientists talk about the explosion of stars called supernovas, which happen millions of miles away in space. People also use the word metaphorically: a population explosion means rapid growth in the number of people living somewhere, and an explosion of laughter describes when everyone suddenly starts laughing at once.

The word can also describe a sudden outburst of emotion, like when someone has an explosive temper and suddenly gets very angry. Similarly, explosive growth means something is expanding or increasing dramatically fast, like how a successful video might get an explosive number of views in just a few hours.