Default Template

When you select (File > New) to create a new presentation a blank presentation is displayed which uses the default template.
This is black text on a white background.
The template Blank.pot is automatically used for any blank presentations

When you open a new blank presentation you are only given one slide master the "Master Slide". In order to create a separate "Title Slide" select the Slide Master first by View, Master, Slide Master then select Insert / NewTitleMaster

Default template location:
PowerPoint 365 - C:\Documents and Settings\"user name"\AppData\Microsoft\Templates\
PowerPoint 2021 - C:\Documents and Settings\"user name"\AppData\Microsoft\Templates\
PowerPoint 2019 - C:\Documents and Settings\"user name"\AppData\Microsoft\Templates\
PowerPoint 2016 - C:\Documents and Settings\"user name"\AppData\Microsoft\Templates\

Default Slide Master

40% SS

Default Title Master

40% SS

Default Colour Scheme

SS of palette

Creating your own Default Template

You can create your own default template
All you need to do is save it using the filename Blank.pot
This means that the Masters and the colour schemes will be copied from this presentation and not the boring default one.
To revert back to the original template just delete the Blank.pot file.

(File > Save As) save as type "Design template with .pot"
The folder will be automatically changed to the folder where the default templates are saved