A more thorough explanation:

Definition: Ex officio service is a type of service that an official is required to perform because of their position or title. This means that they have a duty to carry out certain tasks or responsibilities, even if they do not want to.

Example: A local sheriff is required to perform marriage ceremonies as part of their ex officio service. This means that if someone requests that the sheriff perform their wedding ceremony, the sheriff cannot refuse to do so.

Explanation: The example of a sheriff performing a marriage ceremony illustrates ex officio service because it is a task that the sheriff is required to do because of their position. Even if the sheriff does not want to perform the ceremony, they must do so because it is part of their ex officio service. Other examples of ex officio service might include a judge presiding over a court case or a mayor attending a city council meeting.