Which of the following is the built-in web browser for macOS?

Safari is the built-in web browser for macOS, developed by Apple specifically for their operating systems. It is optimized for performance and efficiency on Apple hardware, offering features such as energy-saving technologies that help extend battery life on portable devices. Additionally, Safari includes integrated privacy features and supports various web standards, making it tailored for the macOS environment.

Other browsers like Chrome and Firefox are cross-platform and widely used but are not native to macOS. Internet Explorer, on the other hand, is a Microsoft browser primarily associated with Windows operating systems and is not available on macOS. Therefore, Safari stands out as the correct answer as it is the default browser designed specifically for Apple users.