PDF417 is a type of two-dimensional barcode that can store a large amount of information in a compact format. It consists of stacked rows of black and white patterns, which can be scanned by barcode readers. This makes it useful for applications like shipping labels, identification cards, and inventory management. One of the key features of PDF417 is its ability to encode various types of data, including text, numbers, and binary information. It can hold up to 1,850 alphanumeric characters, making it suitable for complex data storage needs. This versatility has led to its adoption in various industries, including logistics and transportation.