PPSSPP is an excellent emulator of the Sony PlayStation Portable console. It supports loading the ROMs of PSP games (ISO, CSO, PBP, ELF files), demos and homebrews.
Everything you need for perfect emulation
The PPSSPP interface consists of 3 main tabs: Recent, which displays the titles played recently, Games, which lets you navigate through the folders of your PC to upload ROM, and Homebrew & Demos.
From the Settings menu, however, you can optimize the emulation parameters. Within the menu, you'll find 4 items:
PPSSPP, moreover, is able to save the state of the emulated console.
The interface is well organized, simple and intuitive, and the design is convincing in its simplicity. The optimization of the settings and emulation parameters, however, are mostly aimed at more expert gamers.
One of the best emulators for Sony PSP
PPSSPP is an excellent emulator for the PSP. It's free, works well, doesn't require installation, offers a high level of configuration, and provides a good level of emulation.
You must remember, though, that you're only permitted to use the emulator if you own the original copy of the game you are emulating.