The wireframe Library (see link above) lets you create very quickly wireframes of an app or website within Miro.
Why do that in miro?
I find this especially useful when you are working on digital prototypes with a team that is new to prototyping but already knows a tiny bit Miro. Instead of asking the team to learn another additional tool like Figma, Sketch or Adobe XD you can build the wireframe directly within a tool the team already knows.
How to make it even better?
Miro has a few integrated apps that will help you build your wireframes even quicker: