Who are they and what do they do? The prompter whispers the script to the actors who have forgotten their part during the performance of a play.
What are the activities of the job? Usually sits between the public and the actors, hidden somewhere where the public cannot see or hear him/her, whispers or speaks quietly to the actors the part of the script that they have forgotten.
Where is it done and under what conditions? In theatres. Usually works only when there is a public performance. His/her working hours are those of the theatre: either afternoon or evening.
What tools/equipment do they use? The text of the play.
What do you need to succeed? There is no requirement for a certain academic level, although it is advisable to have some training in theatre techniques and a clear voice and pronunciation.