What is PTA?
Given the longevity and universal name recognition of our organization, it's easy to understand how "PTA" is commonly used to describe all parent groups, whether or not they are actually affiliated with PTA. Parents, teachers, and even administrators are frequently confused or even unaware of the differences between PTA and other parent organizations.
Simply put, PTA is the nation's original parent group in schools, influencing millions of parents, past and present, to get involved in their children's education. We are a national, nonprofit organization; neither the organization nor its leaders receive any financial benefit from PTA activities. We are composed of more than 5 million volunteers in 25,000 local units. We are run by volunteers and led by volunteers, and we are accountable to parents and schools. We give parents what they want-a way to help their children succeed.
(Excerpt from : http://pta.org/1169.asp)