A "Proof Copy" is a preliminary version of a book or publication that is created for review before the final printing. It allows authors, editors, and publishers to check for errors, formatting issues, and overall presentation. This stage is crucial for ensuring that the content meets quality standards and is ready for the public. Proof copies are often distributed to a select group of readers, including beta readers and reviewers, who provide feedback on the material. This feedback can lead to revisions and improvements, helping to enhance the final product before it is officially released to the market.