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Human resource management (HRM, or simply HR) is the management process of an organization's workforce, or human resources. It is responsible for the attraction,selection, training, assessment, and rewarding of employees, while also overseeing organizational leadership and culture and ensuring compliance with employment and labor laws. In circumstances where employees desire and are legally authorized to hold a collective bargaining agreement, HR will also serve as the company's primary liaison with the employees' representatives (usually a trades union).

HR is a product of the human relations movement of the early 20th century, when researchers began documenting ways of creating business value through the strategic management of the workforce. The function was initially dominated by transactional work, such as payroll and benefits administration, but due to globalization, company consolidation, technological advancement, and further research, HR now focuses on strategic initiatives like mergers and acquisitions, talent management, succession planning,industrial and labor relations, and diversity and inclusion.

In startup companies, HR's duties may be performed by trained professionals. In larger companies, an entire functional group is typically dedicated to the discipline, with staff specializing in various HR tasks and functional leadership engaging in strategic decision making across the business. To train practitioners for the profession, institutions of higher education, professional associations, and companies themselves have created programs of study dedicated explicitly to the duties of the function. Academic and practitioner organizations likewise seek to engage and further the field of HR, as evidenced by several field-specific publications.

In the current global work environment, all global companies are focused on retaining the talent and knowledge held by the workforce. All companies are focused on lowering the employee turnover and preserving knowledge. New hiring not only entails a high cost but also increases the risk of the newcomer not being able to replace the person who was working in that position before. HR departments also strive to offer benefits that will appeal to workers, thus reducing the risk of losing knowledge. 

http://en.wikipedia.org/wiki/Human_resource_management