Integry supports 200+ apps. You can add a query or an action of those apps as a step in a flow block.
In order to run those queries or actions, we will get your user to login to the app (hence, "using user's auth"), and configure any fields that require their input. You can pre-configure some parts of it.
Alternatively, you can also perform an action in another app using your auth. In that case, you will login and configure the step.
A flow block can include both types of actions.