Non-Gaussian states in quantum physics refer to quantum states that do not have a Gaussian probability distribution. These states are important in quantum information processing, quantum computing, and quantum communication, as they can exhibit unique properties and behaviors that Gaussian states do not possess. Non-Gaussian states can be manipulated and generated using various techniques, such as photon subtraction, photon addition, or quantum squeezing. Research in this area focuses on studying the properties and applications of non-Gaussian states, as well as developing new methods for generating and characterizing them. Overall, non-Gaussian states play a crucial role in advancing quantum technologies and understanding the fundamental principles of quantum mechanics.