Most of the programs in your Microsoft 365 subscription (such as Word, Excel and PowerPoint) can be used directly from a web browser.
NOTE: Microsoft recommends Google Chrome or Microsoft Edge.
Maybe you are on-the-go and can't get to your computer and don't enjoy the mobile experience. Maybe it's an application you can't (or don't want to) install on your computer. Whatever the reason, Microsoft 365's browser capabilities makes sure your tools are where you need them.