Editing can be defined in so many ways. It includes:
Preparing a piece of writing for publication: Normally a piece written by another person. Publication may be a book, newspaper or other periodical (magazine).
Doing the work of planning and directing the publication. Planning involves the whole work plan like-1)length or size of the item, 2) nature of item,3)display of item, 4) time taken in editing, 5) process of editing, 6) arranging tools for editing.
Directing involves-1) issuing necessary instructions to subordinate staff, 2) monitoring the work assigned to them, interacting with the production staff, 4) controlling the quality of publication.
Preparing a cinema film, video film, tape recording, or any kind of audio video programme by putting together parts in a suitable sequence.
Arranging data for computer processing-related to research/survey.