Business process outsourcing(BPO) is a subset of outsourcing that involves the contracting of the operations and responsibilities of a specific business process to a third-party service provider. Originally, this was associated withmanufacturing firms, such as Coca Cola that outsourced large segments of its supply chain.BPO is typically categorized into back office outsourcing, which includes internal business functions such as human resources or finance and accounting, and front office outsourcing, which includes customer-related services such as contact centre services.BPO that is contracted outside a company's country is called offshore outsourcing.

BPO that is contracted to a company's neighbouring(or nearby) country is called nearshore outsourcing. Often the business processes are information technology-based, and are referred to as ITES-BPO, where ITES stands for Information Technology Enabled Service. Knowledge process outsourcing (KPO) and legal process outsourcing (LPO) are some of the sub-segments of business process outsourcing industry.

The main advantage of any BPO is the way in which it helps increase a company's flexibility. However, several sources have different ways in which they perceive organizational flexibility. In early 2000s BPO was all about cost efficiency, which allowed a certain level of flexibility at the time. Due to technological advances and changes in the industry (specifically the move to more service-based rather than product-based contracts), companies who choose to outsource their back-office increasingly look for time flexibility and direct quality control.

Business process outsourcing enhances the flexibility of an organization in different ways:
Most services provided by BPO vendors are offered on a fee-for-service basis, using business models such as Remote In-Sourcing or similar software development and outsourcing models. This can help a company to become more flexible by transforming fixed into variable costs. A variable cost structure helps a company responding to changes in required capacity and does not require a company to invest in assets, thereby making the company more flexible.

Another way in which BPO contributes to a company’s flexibility is that a company is able to focus on its core competencies, without being burdened by the demands of bureaucratic restraints. Key employees are herewith released from performing non-core or administrative processes and can invest more time and energy in building the firm’s core businesses. The key lies in knowing which of the main value drivers to focus on – customer intimacy, product leadership, or operational excellence. Focusing more on one of these drivers may help a company create a competitive edge.

A third way in which BPO increases organizational flexibility is by increasing the speed of business processes.Supply chain management with the effective use of supply chain partners and business process outsourcing increases the speed of several business processes, such as the throughput in the case of a manufacturing company.