A PAX Exhibitor is a person or group of people (i.e. - company) that show off their arts (i.e. - video games, table top games, comics) to the interest of PAX attendees.
Where can I find these Exhibitors?
You can usually find exhibitors in the Expo Hall and Tabletop Freeplay. (Please note that they are not limited to these areas. Exhibitors are technically found all over PAX. The two areas mentioned is where you will find the highest concentration of exhibitors.)
Examples of Past & Current Exhibitors
Alienware / Dell
Twisted Pixel Games
Wizards of the Coast