What is an example of a super fluidity?

Superfluidity is a state of matter in which it behaves like a fluid with zero viscosity. While originally this phenomenon was discovered in liquid helium, recently it finds applications not only in the theory of liquid helium but also in astrophysics, high-energy physics and theory of quantum gravity. The phenomenon is related to the Bose-Einstein condensation but not identical: not all Bose-Einstein condensates can be regarded as superfluids and not all superfluids are Bose-Einstein condensates.

In liquid helium the superfluidity effect was discovered by Pyotr Kapitsa and John F. Allen.

The idea that superfluidity exists inside neutron stars was first proposed by Arkady Migdal