Spatial is only part of geospatial data. Placemark handles the rest – attributes – with a particular pizazz. You can edit a whole dataset's attributes in a table view. Update complex JSON values, or edit long-form text values comfortably. Because without attributes, a map isn't a map.
Have a CSV file with coordinates? How about a GeoJSON file? Or some KML from Google Earth? Maybe you're drawing data from scratch. It'll all work great with Placemark. And when you're done with your edits and workflow, you can export to all those formats, and more.
Placemark is perfect for your classroom, newsroom, or situation room. It works if you and a friend have an idea to find all the best coffee joints, or share a new mountain biking trail you recorded with GPS. You can see each other's edits in real-time and get on the same page.