Iron bars are similar to fences, they can be used to block the mobs.
To make Iron Bars, you just need Iron Ore and Iron Ingot using Furnace and then have to use the Crafting Table. Please follow the steps below to make Iron Bars.
In order to make iron bars, the basic item that you need to find is iron ore. Equip your stone pickaxe and find at least six iron ore blocks. You will find some under the ground
Iron Ingot using Furnace
Now you need to use the furnace to get iron ingots as you have required iron ores in stock. Go towards the furnace to add coal and iron ore blocks in it. Add six iron ore in the upper box and coal in the lower box to get six iron ingots in the right-side box of the furnace. Add these iron ingots into your “ready to use” stock.
Now you have to use the crafting table to craft iron bars. Open up 3*3 crafting grid and add six iron ingots in any two adjacent rows as shown in the image below. You will get sixteen iron bars in the right-side box to the crafting table. Add these bars in your “ready to use” stock.