What does it mean for a county commissioner to serve "ex officio" on the county social services board?

A county commissioner serves ex officio on the county social services board if he or she is appointed to the social services board by the board of county commissioners by virtue of his or her office as a county commissioner. A county commissioner who serves ex officio on the county social services board has the right and obligation to participate fully in all of the board's deliberations and to vote with respect to all of the board's decisions. A county commissioner who serves ex officio on the county social services board, however, is not subject to the same term limits and multiple office holding restrictions as social services board members who are not county commissioners and ex officio social services board members.