............. allows you to alter all the slides in the presentation.

In presentation software like Microsoft PowerPoint, the Slide Master functions as the design template framework. It sits at the top of the hierarchy and stores critical layout metadata.
Why Slide Master is used:

• Global Consistency: If you are building a presentation with 50 slides and want to place a company logo in the bottom-right corner or switch the font from Arial to Calibri universally, you only need to do it once on the primary parent Slide Master.

• Efficiency: It eliminates the tedious task of editing slides individually, saving time and ensuring a completely unified design theme across the deck.

• Accessing it: You can open it by navigating to the View tab on the ribbon and selecting the Slide Master button.