This research explores the impact of online selling on consumer behaviour, focusing on the fashion retailer ASOS. It examines how online platforms influence purchasing decisions, analyzes customer satisfaction with ASOS products and services, and identifies strategies for capturing market share. The study utilizes a combination of CARP test and sampling methods to gather data and analyze consumer behaviour trends. The findings highlight the importance of understanding consumer preferences and adapting business strategies to meet evolving needs in the digital marketplace.