Personas are models that represent key customer segments based on observed attributes, goals, behaviors, and influences. They are presented as vivid narratives of fictional individuals to guide product, channel, and messaging design. Creating personas helps simplify decisions, correct misconceptions, improve marketing and sales, prioritize requirements for most valuable clients, support unmet customer needs, and align stakeholders with a shared understanding of customers. For one lens manufacturer, personas led to prioritizing design for their most valuable active lifestyle customers, shifting from a catalog to user need-oriented communication, and establishing experience-based differentiation as a competitive advantage.