Carton flow rack is a gravity flow rack system for cartons or cases. The cartons are loaded on one side of the system, they flow down on the roller tracks, and then are picked from on the opposite end.
Pallet flow rack is a FIFO (first in first out) high-density storage system using pallet rack. Gravity flow systems are placed inside of a rack structure. Pallets are loaded in on the front, pallets roll down and are unloaded on the opposite end.
Drive in rack is a FILO (first in last out) high-density pallet storage system. It allows you to store pallets as deep as you want to in storage lanes.
Cantilever Rack is a heavy duty storage solutions for bulky loads that do not fit in standard pallet racking. Used for Lumber, Pipe, Bar Stock and More.
Selective pallet racking allows direct access to every single pallet that you put in the rack system. Selective rack systems are what you see in a Home Depot or Costco.