This research aims to investigate the impact of social media marketing on buying decisions of Next plc's customers in the UK retail fashion sector. The study will assess the influence of SMM on customer decision-making and buying behaviour. The research will be conducted using a qualitative research approach with primary and secondary data collection. The study will focus on the concept and importance of social media marketing, the influence of SMM on Next plc's customer decision-making and buying behaviour, and the factors that can influence customer decision-making. The study will recommend regular monitoring of customer satisfaction, addressing customer concerns, using social media networks to connect with loyal and potential clients, and focusing on problem recognition to engage customers.