The system response to an interrupt is much faster compared to polling.

When

an event occurs (like a button press or sensor reading), the hardware automatically

interrupts the service routine to return to the normal flow of the program (code) .

When an interrupt occurs the program

temporarily stops, runs an Interrupt

Service Routine (ISR),

and then goes back to where it stopped.

A timer can be configured to generate a recurring interrupt known as time ticker, to repeatedly call a function at a specified rate.

Interrupts allow embedded systems to be responsive without an operating

system.