Neutrinos are subatomic particles that are incredibly small and neutral, meaning they carry no electric charge. They are produced in various nuclear reactions, such as those occurring in the sun and during supernova explosions. Neutrinos are known for their ability to pass through ordinary matter with little to no interaction, making them elusive and difficult to detect. There are three types of neutrinos: electron neutrinos, muon neutrinos, and tau neutrinos, each associated with their respective charged leptons. Despite their small mass, neutrinos play a significant role in the universe, contributing to processes like nuclear fusion in stars and beta decay in radioactive materials.