A Couple Definitions…

What is Globus? The Globus Project produces the Globus Toolkit, which has become the standard for software often called grid middleware.
What is PPDG? PPDG is the Particle Physics Data Grid, a collaboration between 4 computer science projects and 6 physics experiments, including STAR.

What is Globus? The Globus Project produces the Globus Toolkit, which has become the standard for software often called grid middleware.