Arduino is like c++programming but in arduino you can apply electronics projects for easier way .In arduino you can write a program and you can see the output program by connecting arduino board to your computer or laptop. In arduino you can control a robot, or even you can create a sound of songs by the arduino programming. Arduino is board has a Integrated Circuit(IC) this the the one that controlling the arduino.If this chip exceed the overwriting the ic will break but don’t worry the ic is replaceable. In Arduino you can create your project like 7 segment. In manually doing a 7 segment it composed of lots of wiring and sometimes you may need 3 or more breadboard and need to also buy many IC for it and then you need to study the pin configuration of each IC this method is too much expensive. But in arduino if you do this is very simple you don’t no need to spent more money, lots of wiring, and using 3 or more breadbord all you need is to study the code of the 7 segment and the pin configuration of the 7 segment connected to the arduino board carefully to be able it will work