Talent management differs from previous HR processes for hiring, training, and retaining employees—and indeed from HR itself—in several key ways:
Where hiring, training, and retention before were centralized in the HR department, with talent management many of these duties are federated to the front-line managers actually leading the employees in question. In this way the whole organization is responsible for, and has a stake in these activities.
HR is more administrative-focused, dealing with pay, vacation days, benefits, and complaints, while talent management is almost singularly-focused on helping and improving the top talent in the organization. Think professional development vs. tracking attendance.
Talent management is strategic, often manifesting as a company-wide long-term plan closely associated with overall business goals, while HR is more tactical, dealing with the day-to-day management of people.