[2] A single code interface can address all of these equally, or message formats can be tailored to the particular needs of each platform.
[3] Amazon SNS can also deliver messages by SMS to 200+ countries.
[5] Receipt of a message may also be hidden from the user: this service is largely aimed at the internal processing of specific apps rather than as a generic email substitute.
A game might receive bonus-level announcements or unlock keys for in-game purchases by this route.
A ticket booking app could use it for confirmation vouchers, boarding passes or notifications of a delay to a flight.