What Is Master Slide?
https://www.computersprofessor.com/2016/05/what-is-master-slide.html
In power point we have special type of
slide called a slide master. The slide master control contain the
characteristics such as font style, font size, font colour etc..……. called master
text as well as back ground colour and certain effects such a shadowing and
bullet styles etc.…..
When you want to make a global change to your slides
you don’t need to change all slides just go to master slide and apply the
changes once then the slide master automatically updates the existing slides
and appears the changes to any new slide you add to change the information of
the text, select the text in the place folder
and make the change you want.