Explanation:

A core competency is a concept in management theory introduced by C. K. Prahalad and Gary Hamel. It can be defined as "a harmonized combination of multiple resources and skills that distinguish a firm in the marketplace" and therefore are the foundation of companies' competitiveness.

Core competencies fulfill three criteria:

• Provides potential access to a wide variety of markets.
• Should make a significant contribution to the perceived customer benefits of the end product.
• Difficult to imitate by competitors.

For example, a company's core competencies may include precision mechanics, fine optics, and micro-electronics. These help it build cameras, but may also be useful in making other products that require these competencies.