Drafting Chair

I look for a new chair, and I have noticed that most of the similar names of stores that use their chair categories. Executive Chair Manager chair chair chair Computer Drafting chair where do these names come from? What makes a chair more specific to a particular task. And what is a good chair to work, sitting at a computer 12 hours a day? (The computer chairs seem to be at the bottom of the line?) The only two that have prepared me and the executive to do? Source Wikipedia gets best answer, loved to know the history of this campaign, look. Curious, what is it opens a boss chair versus a crib. I think I'll never know.