What is the purpose of Kleene's theorem in automata theory?

What is the purpose of Kleene's theorem in automata theory?

The purpose of Kleene's theorem in automata theory is to establish the equivalence between regular expressions and finite automata. It states that for any regular expression, there exists an equivalent finite automaton, and vice versa. This theorem allows us to manipulate and analyze regular languages using both regular expressions and finite automata interchangeably.