What is the difference between shark nets and shark barriers?

Shark netting and shark barriers sound similar, so they must be the same thing, right? Wrong.

The Less-Than-Effective Shark Nets Protecting Australia's Beaches

Shark net - Wikipedia

Ocean Guardian Barrier Series - Ocean Guardian, Shark Shield

Shark Nets are Ineffective and Harmful to Marine Life

Calls to get shark nets removed from Australia's beaches from

Shark Prevention Nets

Saving sharks - The Australian Museum

Shark nets: Weak science behind NSW bather protection program

Shark nets create false sense of safety and should be phased out

Shark - Wikipedia

EXCLUSION NET VS SHARK NETS – Shark Spotters