In the context of PSP gaming, an (or .iso) is a raw, bit-for-bit digital copy of the data contained on a UMD (Universal Media Disc), the PSP's proprietary physical game format. Think of it as an exact digital photograph of the entire game disc.
To play the Superman Returns ISO today, modern gamers typically use one of two primary methods: software emulation on modern devices or custom firmware on an original PSP console. 1. Emulation via PPSSPP (PC, Android, iOS) Superman Returns Psp Game Iso