The Google Drive desktop application allows access to files stored on Google Drive in the computer's File Explorer, without the need to use a browser. On Windows computers it appears as a drive in Windows Explorer, and on Mac computers it appears as a link under Devices in Finder.
Google Drive files are not stored locally on your computer, saving local drive space. Instead, files are streamed on demand as needed. Files that you need to use when you do not have Internet access must be made available off-line in advance. Making files available off-line stores a local copy of the file or folder on your computer, so it is available without Internet access.
On a Windows PC, right-click a file or folder in Google Drive and select Offline Access | Available offline. On a Mac, Ctrl-click the file or folder and then select Offline Access | Available offline: