People would cry or cry when they saw some touching scenes or clips. This was because the tear glands in the eyes were stimulated by emotions and secreted tears. These tears could cleanse the eyes and also express emotions to alleviate the pain in the heart. There was a close connection between the human brain and eyes. When we see beautiful things or feel strong emotions, our brains send signals to our eyes to urge our tear glands to secrete tears. This reaction was formed during human evolution. It can help people express emotions, transmit information, and also protect their eyes from being soaked in tears. When we see touching scenes and clips, we will feel strong emotions in our hearts. These emotions may be joy, sadness, touching, heartache, and so on. By expressing these emotions through tears or crying, it can help people better express their feelings and also convey emotional messages so that people can better understand each other.