Slide layouts have been available in PowerPoint since several versions, but it was only with PowerPoint 2007 for Windows (and PowerPoint 2008 for Mac) that you could create your own layouts. Even if your version supports creating new layouts or not, all versions allow you to change the layout of your slide from one to another:
Most slide layouts include a slide title (all except the Blank slide layout). In addition most layouts contain placeholders for content of some sort: subtitles, bulleted text, pictures, charts, etc.
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