The document provides an overview of barcodes, defining them as machine-readable codes used for product identification and stock management. It details the two main types of barcodes: linear (1D) and 2D, with a focus on various linear barcode formats such as UPC, EAN, and Codabar, along with their applications. Additionally, the document outlines the advantages of linear barcodes, noting their ease of design and compatibility with scanners.