During the discovery phase, UX Designers are creating empathy maps and personas for every website or app-based project. Both of them are collaborative tools that help your team to create products that are tailored to the user, thus more likely to result in the product success. Persona is not a real person, but rather a significant user group of your product with similar characteristics and patterns. Personas created based on user research which comes from the observations of many people.
Usually, each persona is represented in a single one-page document which highlights the importance of understanding users. This document may include a description of real users with their needs, goals, frustrations, wishes, expectations, values, backgrounds, demographics, quotes, features or functionalities they want to see, and etc.
You may create one or more personas, but three or four are the best. Simply because you want to limit yourself to the main audience of your project. Each persona enables the designer to focus on a specific group of people and design for somebody instead of focusing on thousands of individuals and design for generic everybody.