In New Maps section you will find the most important maps (e.g. City Navigator Europe, America, Australia) as Image version as well as MapSource version, also called CD/DVD version or gmap version (because of the folder name extension .gmap).
With MapSource/CD/DVD/gmap version installed on your PC/Mac you can create your own arrangements of map tiles from one or different maps using the tools Garmin MapSource or Garmin MapInstall.
Some time ago the CD/DVD versions of Garmin maps came mostly with the program MapSource included (from there the name MapSource version has been established). Now the original versions of this maps come with Garmin BaseCamp and MapInstall included, with which you have about the same possibilities than with MapSource.