If you want to logically categorize your presentation slides so that they can be easily managed, then you should use the Sections option. You are not just limited to adding and renaming Sections — you can also move slides from one Section to another, or change the order of Sections, or collapse / expand Sections etc. Other than these activities, you can also remove a Section, as explained in this tutorial.
Learn how to remove Sections in PowerPoint 2013 for Windows.

