A time-triggered system is like a clock that can tell when it's time to do something. It's like when you set an alarm on your phone. Every day, your phone's alarm goes off at a certain time, and you know it's time to get out of bed. A time-triggered system is like that, but it's used for computers and other machines. It can tell the machine when it's time to do something, like start a program or process some data.