Customer personas are fictional representations of a business's ideal customers. They are created based on market research and real data about existing customers. By understanding demographics, behaviors, and motivations, businesses can tailor their marketing strategies to better meet the needs of their target audience. These personas often include details such as age, gender, interests, and purchasing habits. By using customer personas, companies can create more effective marketing campaigns, improve product development, and enhance overall customer experience, leading to increased satisfaction and loyalty.