How do defined terms and undefined term relate to each other?

Defined terms are concepts in mathematics or logic that have specific meanings established through definitions, while undefined terms are foundational concepts that are accepted without definition, serving as the building blocks for theorems and definitions. For example, in geometry, terms like "point," "line," and "plane" are often considered undefined. Defined terms rely on these undefined terms to convey more complex ideas, creating a structured framework for understanding and communicating concepts.