TNT

TNT is an explosive block that can destroy blocks in a large radius. Flint and Steel is used to light TNT. It can destroy all blocks except Obsidian and Bedrock. Some blocks are tougher to blow up due to blast resistance.

Crafting
4 sand and 5 gunpowder are required to craft TNT.

Uses
TNT can be used for easy clearing or a sadistic way to kill mobs. It can also be used for entertainment/amusement purposes or resource-finding purposes or using TNT for traps. Using it near bedrock or where resources are known to be found isn't recommended, because if a block can be destroyed and is, there is a high chance it will not have any drop.

Trivia

 * Creeper explosions and TNT explosions make about the same size explosion.
 * In Creative, TNT was not light able until Update 0.8.0.
 * Enderman can pick up TNT, but if primed, it will immediately drop it.
 * Blocks cannot be destroyed by TNT underwater.
 * As of Update 0.9.0, TNT can be lighted by lava.
 * TNT is one of the more iconic blocks in Minecraft, being similar to the creeper and having existed since an early version.