Browser is the term for the program that gets you around the Internet. There is always a browser included with any computer you buy. Microsoft included Internet Explorer before, and now Edge in Windows 10. Google has Chrome. Apple has Safari.
Sometimes there will be more than one browser in your computer, that’s OK. Remember that they are the same program built by different companies. They do the same job; just look a little different from each other…like car companies make the same type of vehicles (sedan, truck, etc.). Which one you use is up to you. Unfortunately, sometimes one works at a certain website better than another.