What is the real function of amulets?

It is believed that amulets endowed with special energy (such as lighting) can resist yin and evil spirits. Make it inaccessible

Thereby playing a role in ensuring security, happiness and not bad luck.

Just like self-defense armor. Of course, whether you believe in evil spirits is your own problem.

What is its function? It is generally believed that it can avoid mental injury, bad luck and so on.