Which term describes the structure shown in the picture that interrupts the movement of waves to the shore?

I love watching footage of surfing it’s so awe in inspiring .. especially big wave surfing oh my what a feat.

This brings back memories. I never saw a breakwater until I went to live in Australia as a child. I remember fishing with my brother, off the breakwater in Warnambool.

There are lots of measures being taken to stop coastal erosion in Norfolk, England but the rate at which land is slipping into the sea in some places is very worrying.