The web browser is by far the most important piece of software on your PC—at least for most users. Unless you’re at a workstation crunching numbers or editing the next Star Wars you probably spend the majority of your computer time staring at a web app or a website.
That’s why it’s important to make sure you’ve always got the best tool for the job. In 2019 that does not include Internet Explorer. If you still want the built-in option for Windows, that would be Edge, though not for much longer as Microsoft plans to replace Edge (or at least its underlying technology) with a Chromium-based browser. Whatever happens with Edge there are so many other options out there including Google’s Chrome, Mozilla Firefox, and Opera.