"Self-publishing is the publication of media by its author without the involvement of an established publisher. The term usually refers to written media, such as books ...
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and magazines, either as an ebook or as a physical copy using POD (print on demand) technology. It may also apply to albums, pamphlets, brochures, games, video content, and zines. Web fiction is also a major medium for self-publishing.
In the traditional publishing model, the publisher bears all the costs and risks of publication, but retains most of the profit if the book is successful. In self-publishing, the author bears all the costs and risks, but earns a higher share of the profit per sale." - (en.wikipedia.org 27.12.2021)