Armour

There are Normal, Iron, Gold, and Diamond

Normal: they are simply normal and the color depends on your team color

Iron: chestplate costs 20 iron while leggings and boots costs 10

Gold: costs 6 gold while legging and boots costs 3

Diamond: costs 4 emeralds while leggings and boots cost 2

Amour reduces your damage taken,duh.Also,iron armour reduces the damage by 2,e.g wooden sword does 3 damage but with iron armour it does two.The best being gold at the start of game,due to high protection and mediocre cost,is recommended.