The document discusses Apple's iPod product line and categories of new product development. It provides details on the different types of new products including new-to-world products like the iPod, new product lines, additions to existing lines, improvements and revisions to existing products, repositioning of products, and efforts toward cost reduction. The document then focuses on the history and evolution of the iPod, from the original 2001 launch through various generations and spin-off products that expanded its market and positioned Apple for success.