Emotional intelligence, EQ, is the kind of intelligence that measures how effective a person is socially; it evaluates people's reactions, and is overshadowed by IQ. It is thought to be higher in women.
Don't mistake this for being "emotional," as there is so much more to it: it is described as being aware of not only one's emotions but also others', understanding, defining, managing these emotions; and making effective use of them, both intra- and inter-personally.
People with high EQ are more successful in the work place. If you are one of these people, the points below should be quite familiar to you.