Barriers to entry is a fundamental concept in industrial organization and strategic management. It refers to the various impediments that make it difficult or costly for new firms to enter a market or industry and compete with existing firms, thereby influencing the level of competition and market structure. As a research concept, it investigates the nature, sources, and impact of these obstacles on market dynamics, incumbent firm advantage, and strategic behavior. Key characteristics include their diverse forms, such as economies of scale, regulatory requirements, proprietary technology, brand loyalty, or strategic actions by incumbents, and their significance lies in shaping market efficiency, competitive intensity, and strategic decision-making.