Teacher:In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Teacher: Now, understand the problem? Solve this instance: A webcast is a type of media file used on the Internet .
Student:
A webcast is a media presentation distributed over the Internet using streaming media technology to distribute a single content source to many simultaneous listeners / viewers .