In the workplace.you may have to do the work of another person for a short time because he or she who usually does that job is not there.Especially for all the top positions.announcements are made in the organization to inform people of who will be doing those important jobs.Of course.there are various reasons for assigning a person to do someone else's job temporarily For example.a vice president has to take several months off to have a baby.so the company allows her on a 26 week' maternity leave and appoint another person as acting vice president.Another example is a period of time when the person in a position has resigned and the company cannot find any permanent replacement immediately.so the company has to appoint someone to act as that job title.Therefor.it is not unusual to see the word Acting
or Act in some job titles such as Acting Manager.Acting President.Acting Chief Executive Officer and so on.