Some companies consistently outperform their rivals. Competitive advantage is the set of conditions that make that outperformance possible. It may rest on lower costs, superior product features, a stronger brand, exclusive access to resources, or a network of relationships that others cannot easily match. The advantage must be sustainable enough to generate returns above the industry average for a meaningful period.

Michael Porter’s frameworks distinguish cost leadership from differentiation and focus strategies. Resource-based views emphasize unique, hard-to-imitate assets and capabilities. Either way, advantage is temporary unless the firm continues to invest and adapt. Competitors observe success and attempt to copy or leapfrog it.

Managers analyze their own sources of advantage and those of rivals in order to decide where to compete and how to defend position. Advantage that depends on a single factor is fragile; advantage that rests on a system of reinforcing activities is harder to dismantle. The search for and protection of competitive advantage remains a central task of strategy.