Personnel psychology is a way to understand how people behave, think and feel at work. It helps us learn how to make workplaces better for people by thinking about things like how to hire the right people, how to train them, and how to make them happy.
Imagine you are playing a game with your friends. Your friend has to choose someone to throw the ball to. They want to make sure they choose someone who is good at catching the ball, right? Personnel psychology is kind of like that. It helps bosses choose the right people for the right job based on things like skills, personality, and experience.
It also helps people who work together understand each other better. For example, if your friend is upset because they didn't get a promotion, personnel psychology can help you understand why they might be feeling that way and how you can help them feel better.
All in all, personnel psychology is like a big puzzle that helps us fit together all the pieces of a happy and successful workplace!