Ceativity. There are two unique options in MC to play, survival/hardcore(harder) or creative mode. In creative mode you have unlimited blocks to build with and you can build anything.
Survival/hardcore is basicaly what it says, hardcore is the same but much harder. You start out at a random place where you have to gather resources from such as wood, food etc. And you need to find yourself a place to build and survive. There are many methods of playing this. Simple freestyle, go to the end(fight a dragon) or just go wherever you want.