Automata theory is a branch of theoretical computer science that deals with the study of abstract machines and their computational capabilities. It forms the foundation for understanding the limits and possibilities of computation. These concepts provide a theoretical foundation for understanding the capabilities and limitations of computational systems and play a significant role in the development of programming languages, compilers, and various aspects of computer science. The field extends into more advanced topics such as computational complexity, formal language hierarchies, and the theory of computation. Automata theory is not only important for understanding computation but also has applications in areas like compiler design, software verification, and artificial intelligence.