General A general duty or duties (responsibilities) is/are actions a person must or is expected to perform. For example, society expects parents to exercise certain duties in caring for their...
a webmaster is someone that creates and edits websites.
a webmaster is a person who looks over a comppany's or their own webpage
duty (a moral or legal obligation)
The most important duties of the President are: uphold the law, control the US Military, and keep the peace.