Another one of the basic technical concepts of RFID is anticollision. To understand anticollision we first must define a collision. An RFID collision involves multiple cards crashing into each other within a reader’s field. This crash need not be a physical touching of cards but rather sending a response to the reader at the same time such that the reader cannot differentiate between cards. Because a major benefit of RFID systems is the rapid throughput and the user convenience that comes from the simple presentment of the token within a reader’s field, the likelihood that more than one card will at times be within this field is great. Thus anticollision–a means to process cards when a collision occurs–is critical.