What is a program with a graphical user interface used for displaying HTML files and navigating the Web?

A program with a graphical user interface designed for displaying HTML files and facilitating navigation across the Web is referred to as a browser. Browsers, such as Chrome, Firefox, and Safari, render HTML content so users can interact with websites visually by clicking on links, filling out forms, and viewing multimedia content.

The purpose of a browser is to serve as a user-friendly tool that consolidates various Web technologies, making it easy for users to access information online. In contrast, a server is a system that hosts websites and manages network resources but does not directly interact with users in the way a browser does. E-mails pertain to a distinct form of communication and are not directly related to web navigation. A web client can refer to different types of applications that interact with web services, but it is less commonly used in this context compared to the term "browser." Thus, the most accurate term for the described functionality is a browser.