Whenever you inject a component using the

The component binding injects a specified component into an element, and optionally

Custom elements provide a convenient way of injecting components into your views.

For Knockout to be able to load and instantiate your components, you must register them using ko.components.register, providing a configuration as described here

Components are a powerful, clean way of organizing your UI code into self-contained, reusable chunks. They: …can represent