types of grammars

Grammars in linguistics and formal systems define how words and symbols are combined to form valid sentences or expressions. Types of grammars include regular grammars, which generate simple patterns like phone numbers or tags; context-free grammars, which describe nested structures such as mathematical expressions or programming language syntax; context-sensitive grammars, which handle more complex rules depending on context; and unrestricted grammars, the most general form, capable of producing any computable language. Each type differs in complexity and the kinds of structures they can generate, reflecting how flexible or restrictive the rule system is.