Describe each of the core functions of human resource management (HRM) to someone who knows little about HR

Describe each of the core functions of human resource management (HRM) to someone who knows little about HR. How would you explain each function to the average person? For each function, describe in two sentences or less.

Which two functions do you believe to be the most important for human resource management? Explain your answer and provide a workplace example to support your response.