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The manuscript is then typeset, and then comes proofreading. The proofreader checks the proofs provided by the printer against the marked-up manuscript. Their proofreader looks to see that the manuscript was set accurately, and that all the instructions of the copyeditor were followed. The proofreader may also correct errors that the copyeditor missed, but that's not a big part of the job.
There's a tremendous amount involved in both jobs, but copyediting is generally to be better-paying because it is more demanding.
For more information, consult books such as The Chicago Manual of Style, 15th edition, and Words Into Type.
And good luck! Many web sites suffer from a complete lack of either copyediting or proofreading, so if you plan to copyedit and proofread your content you may find that it helps your site stand out.