CAD file created in the Jam Standard Test and Programming Language (STAPL) format, a standard file format used for programming PLDs (Programmable Logic Devices); includes the data and algorithm needed to program a PLD; enables vendor-specific programming requirements to be communicated to PLD programmers in a recognized format.

JAM files are typically generated by a vendor-specific software program, referred to as the "Jam Composer." PLD vendors then distribute JAM files to customers (device programmers), who program and test a PLD using the "Jam Player." The Jam Player reads the JAM file and provides the facilities needed to program the device in a standard JTAG (Joint Test Action Group) chain. This process used to be carried out using separate command line tools provided by Altera, but it is now encapsulated in Altera's Quartus design software. NOTE: JAM files are stored in an ASCII text format. They can be compiled into .JBC byte-code files for a binary representation.

Audio recording or loop created with a Line 6 product such as the Spider Jam amp or JM4 Looper pedal; may include sounds for guitars, drums, and other instruments; can also include effects and other audio settings; used for saving loop audio on portable storage cards inserted in Line 6 devices.

JAM files can be converted to .WAV files using the Jam2Wav program.

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.