The purpose of panelization is to secure PCB boards during manufacturing, shipping and assembly processes while making their separation as painless as possible.
A "PCB Shop Fabrication Panel" is not the same as a Customer PCB Panel, yet both are known as "Panels" in their respective industries.
The "PCB Shop Fabrication Panel", is the panel that a PCB manufacturer like OMNI uses to fabricate your boards and panels, it usually contains several "customer panels" or single pcbs.
A "Customer PCB Panel", or simply a "PCB Panel" is the panel that is utilized for assembly, meaning, populating a board with SMD or PTH components, this is the panel you as customer receive.
Panelization can be as simple as a rectangular board tab routed with a 100mil (0.100”) space between PCB boards and a 500mil (0.50”) border on four edges. Or, it can be as complex as a panel filled with combination of Jump V-score or routed rounded polygons.