Personalisation is often treated as a feature, an experiment, a rule, a page variation. But through a data science lens, it becomes something else entirely: a system. In my second month at Dexata, working closely with Adobe personalisation shifted how I think about MarTech, from tools and tactics to decisioning, data quality, and governance. This reflection explores why intelligent experiences depend less on algorithms and more on trusted data, disciplined execution, and connected systems that learn responsibly over time.