it is the 3 "c".....career planning, coaching and career 
counseling....

infact all the other gamets of Hr are confined in these 3, 
such as recruitment, selection, performance apprisal, 
training and development, motivation etc...

Human resource planning or man power planning is the core 
area of human resource management. It is the basic and 
important funcion for a hr person. All other fuctions like 
selection, recruitment, training, motivation will comes 
next.

Hr is involved in ensuring corporate structure is aligned
with business strategy to ensure company vision & objective
are being meet while process excellence is running at maximum.

HR is involved in "People" "Plans" and "Processes"

The 3 P's.  Both other answers are 'old school' dictionary
definitions and way off the mark for companies that which to
utilize their HR staff in an intelligent, effective and
productive manner.

Hr is involved in ensuring corporate structure is aligned
with business strategy to ensure company vision & objective
are being meet while process excellence is running at 
maximum.

HR is involved in "People" "Plans" and "Processes"

The 3 P's.  Both other answers are 'old school' dictionary
definitions and way off the mark for companies that which to
utilize their HR staff in an intelligent, effective and
productive manner.