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With the Google Drive Windows utility installed, files sync from Google Drive storage to a local folder. Slim green checkmarks indicate synced folders.
The large icons indicate Google-formatted docs, which are only available for editing if you are online or if you are using the Chrome-only Offline features.
As befits the maker of Gmail, sharing from Google Drive is exclusively via email. (You can choose from your Gmail contacts list or enter addresses directly, or both.)
Google Drive sharing permissions offer far more than Dropbox. You can make a folder public or private. For each person you share a file or folder with, you can give them the rights to edit, view and comment, or simply view. There's no "get a link" feature.