wiki does it better:
Type A
The theory describes "Type A" individuals as ambitious, rigidly
organized, highly
status-conscious, sensitive, impatient, take on more than they can handle, want other people to get to the point, anxious, proactive, and concerned with
time management. People with Type A personalities are often high-achieving "
workaholics" who multi-task, push themselves with deadlines, and hate both delays and ambivalence.
[4]
In his 1996 book,
Type A Behavior: Its Diagnosis and Treatment,
Friedman suggests that Type A behavior is expressed in three major symptoms: (1) free-floating hostility, which can be triggered by even minor incidents; (2) time urgency and impatience, which causes
irritation and
exasperation usually described as being "short-fused"; and (3) a
competitive drive, which causes
stress and an achievement-driven mentality. The first of these symptoms is believed to be covert and therefore less observable, while the other two are more overt.
[5]
Type B
The theory describes "Type B" individuals as a contrast to those with Type A personalities. People with Type B personality by definition generally live at a lower stress level and typically work steadily, enjoying achievement but not becoming stressed when they do not achieve. They may be creative and enjoy exploring ideas and concepts. They are often reflective.