This report provides an in-depth analysis of the impact of Information Technology (IT) on business operations, success, and failure, using Barclays as a case study. It explores the critical role of IT in decision-making, marketing, business growth, customer support, and resource management. The report delves into ethical and social issues arising from IT use, including privacy, access rights, security, copyright, liability, and piracy. It differentiates various networking technologies (LAN, MAN, WAN), highlighting their characteristics, advantages, and disadvantages. Furthermore, the report examines the importance of social media in business, focusing on Barclays' strategies for gaining attention, improving communication, increasing engagement, cost-effectiveness, and driving sales. The report also outlines the stages of the Software Development Life Cycle (SDLC), from planning to software development. The report concludes with a discussion on the key findings and the implications of IT in business, referencing relevant literature throughout the analysis.