Sourcing involves actively searching for and researching potential candidates beyond just posting jobs and waiting for applications. It provides benefits like better quality hires and more control over the hiring process. Sourcing requires skills in areas like recruitment intelligence, social media engagement, and research. Effective sourcing can be achieved through a dedicated sourcing role or by training all recruiters. The document provides tips for organizations starting a sourcing strategy, including defining clear roles and responsibilities, focusing initial searches on known networks, and keeping early efforts simple.