Can someone give me an easy explanation of what iOS means

iOS:

i(Phone/Pad) O(perating S(ystem).

This is the Apple system software that makes your device(s) work.

Mommysalami ~ iOS is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. An operating system, or "OS," is software that communicates with the hardware and allows other programs to run. It is comprised of system software, or the fundamental files your computer needs to boot up and function. Every desktop computer, tablet, and smartphone includes an operating system that provides basic functionality for the device.

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iPhone Operating System (iPhone) --> About iOS 14 Updates - Apple Support