TNT is a placeable explosive. Its countdown is activated by Fire touching it or a Redstone current. The countdown can not be stoped once activated. Obsidian and Bedrock can not be destroyed by TNT.
Recipes to obtain Tnt
Tnt can not be crafted.
Recipes that require Tnt
Tnt can not be used for crafting.
Recipes to smelt Tnt
Tnt can not be smelted.
Recipes that require Tnt to smelt
Tnt can not be used for smelting.