This iMac 12.5” computer runs macOS High Sierra and is very capable. It served me well for many years, but I bought a newer and bigger one. It has 8 Gb of memory, Radeon HD monitor, an internal DVD drive, and 500 Gb hard drive. It also comes preloaded with a lot of software: MS Office for Mac, Quicken 2007 for Mac, and numerous games such as Minecraft, chess, bridge baron, and many others. Hardware included: wireless keyboard (Apple), wireless mouse and pad, and a number keyboard.