Information Networks is the Second chapter that has been added in the syllabus of Computer Science ICS-I (Intermediate Part-1). Today, Computer Science is widely used in almost 99% of the organizations and its importance cannot be neglected today. After the introduction of Computers, the business world changed forever. Almost 99% of the businesses today use Information Technology to ensure their departments run smoothly. Information Technology is widely used today in the core departments of all the organizations like Human Resources (HR) / Personnel, Finance, Budget and Security. In this chapter the students will learn about the Basics of the technology of workgroup computing, The benefits of E-mail and its software, Internet and why is it useful?, LAN and WAN and some Basics of concepts of modals, standards, network topologies and modes.