Clash of Clans is a strategy MMO game designed for smartphones by a company named Supercell.
Clash of Clans is one of, if not the, most popular mobile games the last few years. This game is successful for many different reasons and there are hundreds of copycat games you can find which is a great indicator of a successful game. This game is very straightforward when you start playing it which makes it easily accessible (age and previous gaming experience are irrelevant). Your goal in this game is to build a village as tough as possible so your enemies have hard time breaking into it and stealing your resources while at the same time building and upgrading your army to attack other players and steal valuable loot from their villages.
Clash of Clans official TV commercial: