Iron bars are blocks that act similar to glass panels, but are made of iron instead of glass. They were added to Minecraft in Beta 1.8. They are placed in the same way as fences, glass panes, cobblestone walls, etc. However, unlike fences, they can be jumped over since they only register as 1 block in height.
Iron bars (via screenshot)
Iron bars can be crafted or found in naturally generated structures such as strongholds, woodland mansions, villages, etc. You can pick up naturally generated iron bars by breaking them with a pickaxe. To craft iron bars you will have to place 6 iron ingots in a 2x3 pattern horizontally.
Crafting Iron bars (via screenshot)
As with glass panes and fences, iron bars can be used to create narrow slits when placed between a door and a solid block. Mobs can see through and attack through these gaps, and arrows may be shot through them. Also as with fences and glass panes, arrows cannot be shot through iron bars themselves. Iron bars are also used to speed up the curing process of zombie villagers.
A zombie villager kept in a cage made from iron bars (via screenshot)
Iron bars are structural and decorative blocks that are used most for building. They have slits in them allowing players to shoot arrows through them making them great for defending against groups of hostile mobs.
A. To make iron bars, place 6 iron ingots in the 3x3 crafting grid in a 2x3 layout.
A. No water cannot flow through iron bars, so they can be used to create air pockets underwater.
A. Mobs can see through and attack through these gaps, and arrows may be shot through them.
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