What is the Slide Master In PowerPoint and Why is it Used? Without further adieu, let’s get started! 1. So, in this article, I’ll share with you all the details you need to know about a Slide Master in PowerPoint. Retrospectively thinking, having a “Slide Master” in PowerPoint is such an important feature! Knowing how to use the slide master properly can help you save a lot of time while creating a presentation! You can also use the slide master to create footers, add watermarks and slide numbers, generate custom presentation templates, edit placeholders, among other things. It allows you to make changes to all slides at once. Slide Master in PowerPoint allows you to have master control over all slides. Furthermore, some of the changes I made to the slide master were scary at first simply because I didn’t understand how it worked! I didn’t quite understand its purpose and how it worked. In fact, when I first learned about it, I was quite confused. When I first started using PowerPoint, I had no idea about the “Slide Master”.