At its best professional sport is the peak of the sports industry that supports those organisations below it by generating financial resources and cultural respect. At its worst, it is a ravenous commercial animal with an insatiable appetite for financial, cultural, and social resources.
Professional sports organisations are those in which competitive commercial revenue is used to sustain their operations, as opposed to those organisations that are funded by the State, or almost exclusively through membership fees or subscriptions.
There are two unique features that define professional sports:
Interesting Point: They can, however, be non-profit and not privately owned.
Source: Hoye, R. S., Smith, A., Nicholson, M. G., Stewart, B., & Westerbeek, H. M. (2012). Sport Management: Principles and Applications. Third Edition