Musical score saved in a human-readable, text-based format; represents notes and chords using text descriptions, such as "G7," "Bdim," and "Fmaj7."

JAM files can be played back in Pyva.net JAM using instrument voices from a software synthesizer. The data can also be output to a MIDI device. Since JAM files are text-based, they can be edited with a text editor.

JAM files can be used to play back audio samples, but do not contain actual audio data.

Modification or add-on for the Playstation 3 version of Unreal Tournament 3 (UT3); may contain modifications to the characters, objects, maps, or the gameplay itself; typically named "USERDATA.JAM."

JAM files must be saved on a memory card or USB flash drive and transferred to a PS3 console in order to work. They are not meant to be used on a PC.