Antineutrinos are subatomic particles that are the antimatter counterparts of neutrinos. They are extremely light and neutral, meaning they carry no electric charge. Antineutrinos are produced in various nuclear reactions, such as those occurring in nuclear reactors and during supernova explosions. These particles interact very weakly with matter, making them difficult to detect. Scientists study antineutrinos to understand fundamental processes in particle physics and to gain insights into the workings of the universe. Their elusive nature has led to advancements in detection technology and has implications for neutrino oscillation research.