Meaning of axioms of completeness in consumer theory?

In consumer theory, the axioms of completeness assert that consumers can rank any two bundles of goods according to their preferences. This means for any two bundles A and B, a consumer can determine whether they prefer A to B, B to A, or if they find them equally preferable. This axiom ensures that preferences are well-defined and allows for consistent decision-making, which is fundamental for analyzing consumer choices and utility maximization.