As the game's state changes, the game provides information on state changes to the player in the form of feedback through its visual, aural and tactile outputs. Presenting feedback to players allows them to structure their actions based on the game state moment to moment. This feedback can take many forms, typically falling in line with a presentational style the designers have chosen. Rather than focusing on specifics of feedback or trying to analyze the difference between using an audible alarm sound and using flashing red lights, we've chosen to focus on the functions such feedback serves.
As noted previously, such feedback comes through the game's various output channels, in many cases over multiple channels at once.