Iron Ingot

Obtained: smelting of iron ore, crafting of iron blocks, and found in Dungeon Chests

Creates: sword, armor, tools, iron blocks, compass, rails, flint and steel and doors.

Iron ingots are used to make a wide variety of useful objects including minecarts, minecart tracks, compasses, armor, buckets, and tools capable of mining anything but obsidian and bedrock. This makes it one of the most useful items in-game. It creates the middle-tier armor, with diamond being the highest tier.

Trivia

 * While Minecraft does distinguish between ores and metals, it does not have a "steel" item separate from iron; Flint and Steel is crafted directly from an iron ingot, and iron ingots are sometimes referred to as steel.
 * Because coal exists in game, which is made of carbon, it is technically possible to provide a realistic crafting recipe that would create steel by combining iron and coal.

Eisen (Barren) Żelazo (sztabka)