Explosives are substances that undergo rapid chemical reactions, producing gas and heat, which can result in an explosion. They are commonly used in various applications, including construction, mining, and military operations. The energy released during an explosion can cause significant damage and is harnessed for both constructive and destructive purposes. There are two main types of explosives: detonative and deflagrating. Detonative explosives, like TNT and dynamite, explode at supersonic speeds, while deflagrating explosives burn at subsonic speeds. Understanding the properties and uses of explosives is crucial for safety and effectiveness in their applications.