This report examines the crucial role of Information Technology (IT) in business, using Barclays Bank as a case study. It explores how IT functions contribute to both the success and potential failures of a business, highlighting the importance of digital marketing, customer satisfaction, resource management, and decision-making. The report also addresses ethical and social issues related to business operations, such as sexual harassment, health and safety, environmental responsibility, discrimination, and labor unions. Furthermore, it differentiates between various networking technologies, including LAN, MAN, and WAN, as well as point-to-point and multi-point networks. The significance of social media in business is discussed, emphasizing its role in search engine optimization, brand awareness, customer satisfaction, and brand loyalty. Finally, the report outlines the stages of the software development life cycle, encompassing planning, requirement definition, design, development, testing, deployment, and maintenance. The case study of Barclays Bank illustrates how companies are effectively using IT to enhance their profitability and customer engagement.