Read more about transclusion in this article: https://www.devbyseb.com/article/use-...
In Angular 2+, transclusion is a technique that allows you to pass content into a component from outside of the component's template. Transclusion is implemented using the Angular concept of Content Projection. Content Projection is a way of including content in a component that is not part of the component's template, but rather is passed in as a parameter.