Its a cron system for decentralized apps. Since there's no way to run 'cron' trustlessly, this alarm clock creates an incentive to call functions at given time

Its a cron system for decentralized apps. Since there's no way to run 'cron' trustlessly, this alarm clock creates an incentive to call functions at given time periods. Its one of those things that you need some background on Ethereum to understand, but if you understand Ethereum you know why something like could be the cornerstone of a lot of apps.