In 1990, Peter Salovey and John Jack Mayer seminal published an article “Emotional Intelligence” which was the origins of EQ. They also defined Emotional Intelligence as “the ability to perceive emotions; to access and generate emotions so as to assist thought; to understand emotions and emotional knowledge; and to reflectively regulate emotions so as to promote emotional and intellectual growth.” (Joshua Freedman) Later on, Daniel Goleman combined several others' researches with the article of Emotional Intelligence into his most successful book “Emotional Intelligence” and spread the knowledge about EQ all over the world. 

        In some websites, people might see “EI” as the abbreviation for emotional intelligence and might get confused between “EQ” and “EI”. In fact, there is a small difference between “EQ” and “EI”. According to Justin Bariso, “EQ” stands for emotional quotient, and it is often the test to measure people’s kneeled of emotions and how they work. However, “EQ” will not evaluate people’s ability to apply that knowledge in real life. For “EI”, it stands for emotional intelligence, and it includes both EQ and the application in real life. (Justin Bariso) However, it does not hurt if people mixed the use of them because in Daniel Goleman’s own website, he mixed the use of “EI” and “EQ,” and he stated that he prefers “EI” as the abbreviation even though he spreads the word “EQ” around the world instead of “EI.” (Daniel Goleman)

        Emotional Intelligence is not just the ability to control emotions. Indeed, it has different parts. According to Howard Garner, who is the famous Harvard theorist, emotional Intelligence has five different categories; each is Self-awareness, self-regulation, motivation, empathy, and social skills. (Michael Akers & Grover Porter)