Gotcha in FAQs should state components must be registered as State or Input and not Output

[ned2]

As discussed in plotly/dash-core-components/issues/430, under the gotcha All Dash Core Components in a layout should be registered with a callback the reference to Output should be removed, as components actually need to be registered with either a State or an Input.

[nyck33]

what does this mean? can you provide a snippet? my dcc.input value is not being sent to the callback at all. The documentation examples don't use State either.