Chomsky's Hierarchy

Chomsky's Hierarchy classifies formal languages based on their complexity and the types of rules needed to generate them. It has four levels: 1. Regular languages, generated by simple rules, suitable for simple strings like search patterns. 2. Context-free languages, with rules that depend only on a single symbol, used in programming languages syntax. 3. Context-sensitive languages, with rules influenced by surrounding symbols, capturing more complex patterns. 4. Recursively enumerable languages, the most complex, where rules can describe any computable pattern, including all possible algorithms. This hierarchy helps understand the computational power required to process different types of languages and systems.