The Recruit to Retire business process is an end-to-end integrated process of planning, sourcing, and managing the total workforce, starting from the recruiting of a potential employee through the lifecycle of their career to their retirement. Components of the Recruit to Retire process work together to help HR professionals understand, manage and optimize all aspects of the workforce, including employees and external workers, in line with business objectives and with clear financial impact.
The image below shows how SAP SuccessFactors solutions work together with other SAP solutions such as SAP Fieldglass and SAP Concur to manage the employee lifecycle from planning and staffing through payments and offboarding.

The image above shows the components of the Recruit to Retire process: plan, staff, onboard, work, travel, and pay & close.