Difference between Google map and Google earth?

google Earth Pro is the professional version of google Earth with advanced features for business users.

google Earth Pro has following improvements over the free version:

• Pro performance is faster
• Pro has higher resolution printing 4800 pixels vs 1000 pixels.
• Pro able to import GIS data files (e.g. GeoTiff, CSV files, etc.)
• Pro has area measurement tool
• Pro has additional layers (e.g. U.S. Parcel and Demographics data)
• ...

google Earth Pro has an annual subscription of $399 which includes support.

Both google Earth and google Earth Pro use the same imagery. In other Words, you don't get higher resolution imagery by paying for the Pro version.