Barcodes on ID cards, irrespective of the card type, serve as a visual representation of encoded information. While magnetic stripe cards contain data in magnetic tracks, barcodes act as a backup or alternative means for swift data access. Optical scanners often read barcodes, offering an alternative method when magnetic stripe readers are unavailable or malfunctioning. The encoded information can encompass details like the individual’s name, ID number, access permissions, or other pertinent data, depending on the card’s purpose.