Minecraft is a first person game where you can actually do anything from exploring to building and fighting.
First, you are spawned in a world made out of blocks and you basically start a life from nothing. You start chopping wood and you make tools. You go mining and you make your own creations.
When you mine you can find diffrent ores like iron, gold and diamonds, and you can upgrade your tools that way. But when you are in a cave or when night time comes, you have to be careful because in this game there are skeleton archers, zombies, endermen who teleport and creepers who well… explode and they are highly annoying especially when they explode on the things you have made.
It is a very popular game and you can play multiplayer online also. Now I know this game sounds boring, but it is not. There is so much to do. You can also kill bosses like the wither that has three heads or the enderdragon which is a big black dragon. So you can go ahead for yourselves, build creations and see for your self what this game has to offer.