Editorials are generally printed either on their own page of a newspaper or in a clearly marked-off column, and are always labeled as editorials (to avoid confusion with news coverage). They often address current events or public controversies.
Generally, editorials fall into four broad types: news, policy, social, and special. When covering controversial topics such as election issues, some opinion page editors will run "dueling" editorials, with each staking out a respective side of the issue.

Many magazines also feature editorials, mainly by the editor or publisher of the publication. Additionally, most print publications feature an editorial, or letter from the editor, followed by a Letters to the Editor section. The American Society of Magazine Editors has developed a list of editorial guidelines, to which a majority of magazine editors commonly adhere. Most editorial pieces take the form of an essay or thesis, using arguments to promote a point of view.

I hope it would be now easy for you to understand the essence of Editorial in a Newspaper. if anything is still confusing then please go and consult any relevent book of Journalism and see the article of Editorial.