The Personnel & Human Resource Management/Development departments have come a
long way from the time they were synonymous with recruitment and salary
disbursal. Now there are increasing levels of sophistication and
specialization within these departments, and management roles are more
exciting and challenging than ever before. Organizational Behavior
(OB), Organizational Development (OD), Training, Appraisals,
Orgazinational Culture, Knowledge Management… there are several types
of roles within the HR department today. Of course, a lot depends on the organization and leadership team. Management Help reports:

Note that some people distinguish a difference between between HRM (a major management activity) and HRD (Human Resource Development, a profession). Those people might include HRM in HRD, explaining that HRD includes the broader range of activities to develop personnel inside of organizations, including, eg, career development, training, organization development, etc.

Online Human Resources Degrees