What is the purpose of wall putty before painting?

Wall putty is used to create a smooth and even surface before applying primer and paint. It helps fill minor cracks, dents, holes, and surface imperfections, ensuring better wall leveling. Applying putty improves paint adhesion, enhances the final finish, and increases the durability of the paint. A properly puttied wall results in a smoother texture, uniform color appearance, and long-lasting painting results.