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There's no doubt that this is a Google service. If the interface shown here looks familiar, that's because it used to be called Google Docs. Although you can store other types of files here using the Windows Explorer interface, I was unsuccessful in uploading anything other than
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.)