LMAO!
It's all good Breh, I'm older too.
An "Emulator", is a program that "Emulates" the hardware of another computer/system.
It "Virtualizes" the hardware, via software.
It allows you to run original/older games(Nintendo, Sega, Arcade/Mame, etc..), on different hardware (PC, Mac, IOS, Android, Linux, Modded Game Console, Web Browser, Etc...)
"Emulation" isn't only for games it can be used to run a completely different Operating System, on different systems.
(Running Windows 10/11 on MacOS via Parallels Desktop, or Virtual Box. Running Linux on Windows or Mac, via Parallels Desktop, or Virtual Box.)
Nintendo uses "Emulation" to run their "Virtual Console" games, it makes it so that they don't have to completely re-code an older game to play on a new system.
There is also software "Emulation/Compatibility Layers" used for "Backwards Compatibility", (Example: playing PS4 Games on PS5).
Also both Sony and Microsoft use "Emulation" within their cloud gaming services to play older games (Gamepass, PS Plus).