What is meant by masterpage?

A master page is a template used in web development, particularly in ASP.NET, to provide a consistent layout and design across multiple pages of a website. It contains shared elements like headers, footers, and navigation menus, allowing developers to maintain a uniform look and feel while simplifying the design process. Content pages can then be linked to the master page, enabling them to inherit its structure and style. This approach enhances maintainability and reduces redundancy in web applications.