An editor’s job is to improve written communication. They work on all types of written formats, such as books, articles, websites, training manuals, legal documents, corporate publications, and scientific papers. Background knowledge in the subject matter of the materials is essential for an editor to be able to take what was written and make it clear, organized, and appropriate for the target audience. Depending on the quality of the writing, editors may also need to write a good amount of text to make the document clearer or more informative. The specific tasks of an editor include correcting spelling, grammar, and punctuation errors; fact-checking; and rewriting unclear sentences.