What is HRD, HRM and HCM - the differences and the roles performed?

veggie
Kindly tell me - what is HRD, HRM and HCM and the difference between the same. The roles performed under each.
subhathammana
Human resource management (HRM) is the strategic and coherent approach to the management of an organization's most valued assets - the people working there who individually and collectively contribute to the achievement of the objectives of the business.
Talent Development, once called human resource development, is the process of changing an organization, its employees, its stakeholders, and groups of people within it, using planned and unplanned learning, in order to achieve and maintain a competitive advantage for the organization. Rothwell notes that the name may well be a term in search of a meaning, like so much in management, and suggests that it be thought of as selective attention paid to the top 10% of employees, either by potential or performance.
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