When you add Mark Up, it does not affect the underlying original map.
You can save a map with Mark Up as a project and open it later or share it with others using a URL. You can also print the map or export it as an image and email it.
Add measurements, shapes, and text to mark important features, notes, actions or comments.
You can use the Mark Up annotation for your own personal reference, similar to drawing on a paper map. Or you can share it to communicate with others.