I want to document some software code and would like to write one page that defines an object with properties. Then in multiple other pages, I want to reference this object page by embedding it in other pages.

This way I only have to change the object page in order to keep all other pages up to date.

When markdown files need to be repeated in multiple articles, INCLUDE block can be used.

Here is better description: https://dotnet.github.io/docfx/docs/markdown.html?tabs=linux%2Cdotnet#include-markdown-files

Sometimes you want the same information from one page on multiple pages. Something like Bookstack has https://www.bookstackapp.com/docs/user/reusing-page-content/ or Confluence has https://support.atlassian.com/confluence-cloud/docs/insert-the-include-page-macro/

This will prevent information being wrong when changing it on 1 page, but not the other.

Useful if you want a Wiki Page that collects and displays only selected information which lives in a more appropriate dedicated location. Allows for streamlined presentation optimized to specific scenarios by eliminating any manual duplication maintenance for correlated information.

Example, a Printing procedural reference, but which shows key points which are selected from a different more robust & dedicated "All things Printer installation/configuration etc." page.

Include another page on the current page, rather than just having a link.