It is a psychological and physiological state produced by various feelings, thoughts and behaviors. The most common and popular emotions are joy, anger, sadness, surprise, fear, love and so on. And there are some subtle emotions such as jealousy, shame, shame and pride. Emotion often interacts with emotion, personality, temper, purpose and other factors, and is also influenced by hormones and neurotransmitters. Regardless of positive or negative emotions, people will be motivated to act. Although some behaviors caused by emotions seem unexpected, in fact, consciousness is an important part of producing emotions. People's emotions are also naturally controlled.

Psychologists and philosophers have been arguing about the exact meaning of "emotion" 100 years. Emotion refers to the experience of attitude towards external things accompanied by the process of cognition and consciousness. It is the human brain's response to the relationship between objective external things and subjective needs, and it is a psychological activity mediated by individual needs.