What's the difference between an open and closed loop cooling system in a boat engine?

Boat engines have either open or closed loop cooling systems. How do these two differ, and is one better than the other? Here ...
KSL

Closed-loop cooling systems save water but can be a drain on electricity

SALT LAKE CITY — Inside what is, in many ways, a tiny data center that pales in comparison to modern counterparts, the University of Utah runs what it calls Cloud Lab. The lab allows researchers to ...
KSL

Closed-loop cooling systems save water, but can be a drain on electricity

Dr. Robert Ricci describes how closed loop cooling works inside a small data center at the University of Utah. (Mike Anderson, KSL) SALT LAKE CITY — Inside what is, in many ways, a tiny data center ...