sammyjoe-
You basically described the main differences.
Others are / may be;
-Less memory
-Less storage (in some instances solid-state memory of 4 – 20 gb instead of a hard disk)
-Slower & less powerful CPU
-Lower price
-Lower screen resolution
-An older OS (operating system) in order to place less strain on the components
-No upgradability
-Fewer ports (network, external monitor)