In this video, Joed Goh explains the concept of executing multiple tasks in a single program by using the millis function. The discussion uses a common cathode seven segment display, an SG90 servo motor, LEDs, and a tactile switch to illustrate the concept.

04:13 Demo connection on 7-segment display
07:35 Basic Arduino program to control the 7-segment display
10:25 Using 2D array to control digit counter 0-9
12:33 Multitasking in Arduino
18:23 Servo Motor
27:45 Code and Circuit Connection Challenge

***NOTE:
in line 24 (15:20) with the code:
unsigned currentTime = millis(); // the type long is inferred because the millis return type is unsigned long, that's why it works even without explicitly specifying the type.

However, in c-based related programming languages, you must explicilty specify the type as in:

unsigned long currentTime = millis();

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