This is the most common misconception. It is a PSP emulator.
The PPSSPP emulator allows users to play PSP games on various platforms, including PC, Android, and iOS. However, the "Call of Duty: Modern Warfare 2 PPSSPP ISO highly compressed download" seems to be a misnomer, as the game was not originally released for the PSP console. It's likely that a fan-made conversion or a modded version of the game has been created for the PPSSPP emulator. This is the most common misconception