What is the primary function of a browser?

The primary function of a browser is to serve as a program with a graphical user interface specifically designed for displaying HTML files. Browsers act as intermediaries between the user and the internet, allowing users to navigate, retrieve, and view content from websites. They interpret HTML, CSS, and JavaScript, rendering the information in a way that is visually accessible and user-friendly.

While the other options describe functionalities related to software, they do not accurately capture the core purpose of a web browser. Messaging applications are focused on facilitating communication, web design tools are used to create web pages rather than access them, and database management software is intended for organizing and manipulating data rather than for browsing content. Thus, the definition of a browser as an interface for accessing and displaying web content is the most relevant and correct response in this context.