A final touch to the publishing process is typesetting.  A properly typeset book is one where the reader will find it smooth traveling from cover to cover.  Typesetting for your book includes choosing a font or type style, type size, line leading, justification and hyphenation settings for the text of your book.

Before the 1980s, practically all typesetting for publishers and advertisers was performed by specialist typesetting companies. In 1985, desktop publishing became available, starting with the Apple Macintosh, Adobe PageMaker (and later QuarkXPress) and PostScript. Improvements in software and hardware, and rapidly-lowering costs, popularized desktop publishing and enabled very fine control of typeset results much less expensively than the minicomputer dedicated systems. 

Keep in mind that is if you want a professional looking book, you should use the services of a professional typesetter..there are two components that they have that an amateur simply does not. Skills and tools.  Typically amateurs try to get by with a word processing instead of a layout program, and they don’t study the art of typography enough. The resulting layout is almost always obvious to people who know books (like reviewers).