Slices divide an image into smaller images that are reassembled on a web page using an HTML table or CSS layers. By dividing the image, you can assign different URL links to create page navigation, or optimize each part of an image using its own optimization settings.

You export and optimize a sliced image using the Save For Web command. Photoshop saves each slice as a separate file and generates the HTML or CSS code needed to display the sliced image.
https://helpx.adobe.com/photoshop/using/slicing-web-pages.ht...


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Note added at 7 мин (2022-11-22 18:48:18 GMT)
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What Is a Slice?

On this page, you'll learn what Slices are and how you can use them to enrich the content modeling process.

Prismic Slices are sections of your website. Prismic documents contain a dynamic "Slice Zone" that allows content creators to add, edit, and rearrange Slices to compose dynamic layouts for any page design, such as blog posts, landing pages, and tutorials.
https://prismic.io/docs/slice


HTML Slicing

The process of ‘slicing’ builds the technical foundation of your website. Our team of talented programmers ‘slice” up’ the pieces of a website design into HTML5 and CSS in order to create the framework in which your website can be used and searched in a web browser. Slicing ensures your website becomes dynamic and interactive. In other words, slicing makes your website come to life!
https://www.treefrog.ca/services_posts/web-design/html-slici...

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Note added at 10 мин (2022-11-22 18:51:36 GMT)
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Результатов гугл-поиска на "Pages" "slices" примерно 20 800 000 -> https://www.google.ru/search?q="Pages" "slices"&newwindow=1&...