Hi, cowboy! Welcome back!
Okay, this is something that gets a lot of people, so perhaps it would be easiest to say what each of them involves so you can see the differences between them.
PRINTING IS:
1. Taking a manuscript, formatting it into a particular size (mass paperback, trade paperback or hardback size), converting to a PDF or similar graphic and turning it into a bound form. A "bound form" can be:
a) Perfect Binding (pages glued at the edges and cover glued to the pages using heat and pressure);
b) Tape Binding (pages glued at the edges and covered with a narrow strip of cloth using heat and pressure);
c) Coil Binding (pages perforated and metal coil inserted to bind the pages); or
d) Comb Binding (pages perforated and plastic comb inserted to bind the pages).
In most cases, Perfect Binding is the method used to bind manuscripts.
2. Printing CAN include placing an ISBN on the cover, and placing a barcode on the cover.
That's pretty much it for printing. Now, some self-publishing houses offer the following services to aid their customers that are available for an extra fee, PAID by the author:
A. Selling a single ISBN to the author (because they're usually purchased in blocks.)
B. Proofreading the manuscript for spelling errors.
C. Formatting the manuscript to the required format that the printer requires.
D. Providing cover art from stock photographs/drawings on hand.
E. Loading the book's information on websites such as Amazon and Barnes & Noble.com
PUBLISHING IS:
1) Review of an incoming manuscript to adhere to a certain quality control based on other, similar books of the company.
2) Careful review and editing of plot, characterization, timelines and flow to achieve the best possible product to the marketplace.
3) Registering of the copyright with the Library of Congress.
4) Providing as many ISBNs as are required for the forms to be produced, free of charge to the author.
5) Selecting cover art from either in-house or freelance artists that is intended to be eye-catching and reflect the contents of the book, free of charge to the author.
6) Inclusion of the book in catalogues sent to distributors and wholesalers who purchase books for bookstores.
7) Inclusion of the book in marketing pitches to book buyers for stores and chains.
8) Inclusion of the book in paid advertising to bookstores, and paying for special treatment of the book including:
a) Face out
b) End Capping
c) Store "Recommends" ads in hand-outs and flyers
All free of charge to the author
9) Printing of Advance Copies which are sent to reviewers of major magazines, free of charge to the author.
10) Contracting with booksellers to provide credits on invoices for unsold books (returns).
So, what is the difference? Publishing includes SELLING the book--working and paying to place the book in stores, and allowing the store to return unsold copies and get their money back. A printer doesn't do this. A printer doesn't have a distribution chain, or sales representatives, or contracts in place to accept returns from stores.
The product might LOOK the same on the outside, but it's like a glacier. It's what's under the
surface, that the public doesn't see, and the author doesn't see, that is the MAJOR benefit of a commercial publisher.
Does that help?