I have green card but what is pass card? I only hear about pass card. plz explain!

Look at this website. www.uspasscard.com This website explains what it is.

"The Department of Homeland Security is currently developing a passport card system. The proposed new passport card, also referred to as the PASS card, is a limited use passport in a "wallet size" format. The PASS card is currently not available as it is being developed by the United States Government.

PASS cards would be added to the existing list of acceptable proofs of identification, which include passports, the Mexican “laser visa,” and the SENTRI, NEXUS and FAST cards used along the northern border. Secretary of State Condoleezza Rice and DHS secretary Michael Chertoff touted the PASS card program as a traveler-friendly solution to the tightened border credential requirement.

The proposed PASS cards would provide U.S. citizens with a travel credential costing less than a full size passport. The passport card (also being called border card) will be issued by the State Department. The PASS card technology, however, will be determined by the DHS (Department of Homeland Security)."