Clicker games have the player perform simple actions, such as clicking on the screen repeatedly, to gain currency. This can be used to obtain items or abilities that increase the rate at which currency accrues. In some instances the clicking may become unnecessary after a time, because the game may begin to play itself, even in the player's absence, hence the moniker "idle game". The popularity of clicker games has been attributed to their ability to provide unchallenging distractions that fit easily into a person's daily routine.