All slide layouts have a content placeholder.

In Microsoft PowerPoint, the concept of slide layouts is associated with the arrangement of placeholders on a slide. A placeholder is a pre-formatted container on a slide that holds content such as text, images, charts, or media. However, not all slide layouts have a content placeholder.

In PowerPoint, there are various slide layouts available, and they serve different purposes. Some slide layouts have specific content placeholders, while others may not have any content placeholders at all.

Common slide layouts with content placeholders include:

1. Title Slide Layout: Typically includes placeholders for the title and subtitle.
2. Title and Content Layout: Includes placeholders for a title and main content, such as text or bullet points.
3. Two Content Layout: Includes placeholders for two separate content areas.
4. Comparison Layout: Includes placeholders for two sets of content for comparison.
5. Content with Caption Layout: Includes a content placeholder with an additional placeholder for a caption.

However, some slide layouts, like the Blank Slide Layout, may not have predefined content placeholders.

To check which placeholders are available on a specific slide layout in PowerPoint:

1. Open PowerPoint and create a new presentation.
2. Go to the "Home" tab.
3. Click on the "Layout" dropdown in the Slides group.
4. Hover over different slide layouts to see a preview of the placeholders available on each layout.

It's important to note that the availability of content placeholders may vary depending on the PowerPoint version and template being used. Always refer to the specific layout options in your PowerPoint application for accurate information.