What Does Default Browser Mean?
Default browser refers to the browser that is associated with Web documents or Web links. It is also the browser that comes pre-installed with the operating system, e.g., Internet Explorer for Windows, Safari for Apple’s Mac OS or iOS.
Techopedia Explains Default Browser
The default browser is the application that is automatically launched when a user clicks on a Web document or when an application opens a Web link, such as when going to its home page.