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0001 ---
0002 title: 'Reference'
0003 ---
0004
0005 ## Glossary
0006
0007 EIC
0008 : Electron-Ion Collider
0009
0010 ddsim
0011 : The DD4hep command-line driver for Geant4 detector simulations, including a built-in particle gun.
0012
0013 npsim
0014 : A thin layer on top of `ddsim` with ePIC-specific options (such as Cerenkov and optical photon
0015 physics) pre-configured. Recommended for almost all regular ePIC simulations.
0016
0017 eic-shell
0018 : The EIC standard software environment, a singularity/apptainer or docker container with a
0019 curated selection of software components used for EIC simulations and analysis.
0020
0021 EDM4hep
0022 : The common event data model used to store ePIC simulation output in ROOT files
0023 (`.edm4hep.root`).
0024
0025 HepMC3
0026 : The event-record format used to exchange generator-level events (e.g. from Pythia8) as input to
0027 simulation.
