This report provides a comprehensive analysis of Information Technology's role in business, focusing on a case study of Tesco. It begins with an introduction to IT, its components, and its significance in the business world. The report then classifies computers based on size, type, and purpose, including microcomputers, minicomputers, mainframes, supercomputers, analog, digital, and hybrid computers. The report explores the advantages of IT for Tesco, such as improved communication, globalization, availability, job creation, and cost-effectiveness. It also discusses the disadvantages, including potential unemployment, cultural dominance, social security risks, and implementation costs. The report further examines the social and ethical issues related to IT, such as data misuse and security breaches, and concludes with a discussion of the internet's growth and its impact on businesses. The report highlights the importance of IT in retail and its potential to transform business operations, while also acknowledging the associated challenges.