Minecraft is an online virtual world where you are in a world made completely made out of blocks. The trees, ground, and animals are all made out of blocks. You can play creative where you get all the materials without searching. You can also play survival where you have to colect materials to make a base of operations, hunt animals for food, and dig deep for diamond to make tools. Them there is hardcore where you play on the highest difficulty and you can't ghange the difficulty. This game was developed by Mojang.