A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.
Recruitment (hiring) is a core function of human resource management. It is the first step of appointment. Recruitment refers to the overall process of attracting, shortlisting, selecting and appointing suitable candidates for jobs (either permanent or temporary) within an organization.
Internal recruitment (not to be confused with internal recruiters !) refers to the process of a candidate being selected from the existing workforce to take up a new job in the same organization, perhaps as a promotion, or to provide career development opportunity, or to meet a specific or urgent organizational need.