What is Neutrino and anti neutrino?
Neutrino is a neutral particle with an extremely small mass. Neutrinos are produced in radioactive decay like beta decay. They are weakly interacting particles, that is they hardly interact with matter.They take care of the conservation of energy and momentum in radioactivity reaction.They are highly penetrable.Anti neutrino is the antimatter counter part of neutrino. Every
particle has its own antiparticle. Like electron has the antiparticle positron, antiparticle of neutron is antineutron etc.
When a particle and an antiparticle meets both are annihilated and equivalent energy is obtained.