What is the brief definition of staffing?

Staffing is the process by which an organisation creates a pool of applicants and makes a choice from that pool to provide the right person at the right place at the right time to increase the organisational effectiveness. Also, Staffing is the process of acquiring, deploying, and retaining a workforce of sufficient quantity and quality to create positive impacts on the organization's effectiveness.

Staffing not only includes acquiring personnel, but shifting existing personnel to meet specific needs of an organization.