theme
A theme is a model presentation you can use as a starting point for your own presentation. Most themes include placeholder text and images that you replace with your own content, making it easy to get started. You can also delete placeholders, and add new elements, such as images, text boxes, or tables.
Keynote for iCloud themes are designed for some of the more common types of presentations that you might use for business, school, or home.
Note: You can’t switch to a different theme after you begin creating your presentation.