IOS. It's Apple's own custom OS system, built for their tech.
Rapid Application Development is the specific term
There are several things.
Some which include of
<span>Hard Disk Drive (HDD)
</span><span>Processor (CPU)
</span><span>Graphics card
</span>and
<span>Memory (RAM)</span>
A) operating system
It is going to let you "operate" it using the mouse and keyboard
For numb in [5,8]:
for numa in [2,3]:
print(str(numb) + str(numa))