Drafting chairs and office chairs are both types of task chairs, but they have different features that make them suitable for different purposes.
A drafting chair is intended to be used with elevated work surfaces such as a drafting table. These chairs are usually adjustable and have a taller max height than the average office chair. They also tend to come equipped with a foot-ring or footrest, allowing occupants to sit comfortably while they working at an elevated surface. In addition, drafting chairs often showcase an extended seat pan and a slimmer profile, designed to accommodate a forward-leaning posture, which is common in drafting, architecture, or design work.
While drafting chairs are specialized for a specific task, an office chair is a more general-purpose seating option designed for use at standard desks. Office chairs generally come equipped with adjustable heights, seat depths, and armrests to provide comfort and support during a long workday.