Homonym: primer (Coating)
A "primer" is a type of introductory book or guide that helps beginners learn about a specific subject. For example, a math primer might explain basic concepts like addition and subtraction, making it easier for students to grasp more complex topics later on. Primers are often used in education to provide foundational knowledge.
In addition to books, the term "primer" can also refer to a substance used in painting or construction. A primer paint is applied to surfaces before the final coat to ensure better adhesion and a smoother finish. This type of primer helps protect the material and enhances the overall appearance of the project.