The Adobe Photoshop CS4 Extended Student Edition for Mac OS is a comprehensive photo/image graphics editing software by Adobe Systems. This version is specifically designed for students and includes a serial number for activation. With its English language interface and compatibility with Mac operating systems, this software allows users to create and edit high-quality images with ease. As part of the Adobe Photoshop CS4 series, it offers a wide range of tools and features to enhance and manipulate photos, making it a popular choice among photographers and graphic designers.