One advantage of outsourcing is that it allows the primary company to

Outsourcing is a business practice where a company hires an external organization to perform tasks, handle operations, or provide services. One key advantage of outsourcing is that it allows the primary company to focus its resources on its core competencies. By delegating non-core activities to external specialists, the company can concentrate on what it does best, thereby enhancing efficiency, innovation, and competitive advantage in its primary market.

References:

"The Outsourcing Revolution" by Michael F. Corbett

IEEE Software Engineering Body of Knowledge (SWEBOK), Chapter on Software Engineering Management