A column is a recurring piece or article in a newspaper, magazine or other publication, where a writer expresses his/her own opinion in few columns allotted to him by the newspaper organisation.
Magazines are publications, usually periodical publications, that are printed or electronically published They are generally published on a regular schedule and contain a variety of content.
A newspaper is a serial publication containing news, other informative articles, and advertising.
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Columns are written by columnists.
A columnist is someone who writes for publication in a series, creating an article that usually offers commentary and opinions.
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What differentiates a column from other forms of journalism is that is a regular feature in a publication – written by the same writer or reporter and usually on the same subject area or theme each time – and that it typically, but not universally, contains the author's opinion or point of view.
Journalism is the work and distribution of reports on the interaction of events, facts, ideas, and people that are the "news of the day" and that informs society to at least some degree.