Understand the difference between PowerPoint templates and themes …
What is a PowerPoint theme? A theme is a predefined set of colors, fonts, and visual effects that you apply to your slides for a unified, professional look. Using a theme gives your presentation a harmonious appearance with minimal effort. For example:
Create your own theme in PowerPoint - Microsoft Support
To make a custom theme, start with a built-in Office theme and modify it by changing any of the colors, fonts, or effects: Change the theme's color, font, and effect settings. Save the settings as a new theme in your theme gallery. These steps are described below.
Create and save a PowerPoint template - Microsoft Support
Create your own theme in PowerPoint. Save a slide design (theme) as a template. Edit, change, or delete a placeholder. What is a slide master? What is a slide layout? Create and use your own template in Microsoft 365 for Mac. How to make a branded PowerPoint presentation
Change the look and feel of Microsoft 365 - Microsoft Support
Open a Microsoft 365 application, like Word, Excel, or PowerPoint. In the top left, select File > Options > General > Office Theme. Choose your favorite option. The default theme setting for Microsoft 365 is Use system setting, which matches your selected look in Windows.
Download free, pre-built templates - Microsoft Support
You can download free, pre-built document templates with useful and creative themes from Office when you click File > New in your Office app. Templates can include calendars, business cards, letters, cards, brochures, newsletters, resumes, cover …
Apply a template to an existing presentation - Microsoft Support
Under New, you can navigate to a personal or workgroup template, Search for a template, or choose a featured template or theme from the gallery.
Free background templates for PowerPoint - Microsoft Support
For backgrounds specific to a theme, search on a keyword, such as "mountains." Click a template thumbnail, preview the slides by clicking the forward and back arrows, and then click Create when you find the template you want.
Save a slide design (theme) as a template - Microsoft Support
A template includes a theme, but also contains instructions in placeholders suggesting what to insert and what types of information the user of the template might want to include. Save a presentation with a theme (slide design) applied, and save it as a template (.potx file).
Apply Themes to presentations in PowerPoint - Microsoft Support
A fast way to give your slides an attractive, professional look in PowerPoint is to apply a theme. Apply a theme to all slides, or specific slides, for a unique impact. Select Design. Hover over the Themes to preview how it looks, and select the one you like. Select More to see more Themes.
Use multiple themes in one presentation - Microsoft Support
Create your own theme in PowerPoint. Format the background color of slides. Add a background picture (or watermark) to slides. Understand the difference between PowerPoint templates and themes. When you apply a theme, you apply attractive combinations of colors, fonts, and special effects like shadows, reflections, glows, etc.)
Use a personal template to create a new PowerPoint presentation
Click the thumbnail pane and then select the slides you want: Select all slides: Ctrl+A. Select a subset of the slides: Ctrl+click. Copy the slides (Ctrl+C). Switch to the new file, right-click the thumbnail pane, and under Paste Options select Use Destination Theme: