Proofs and colorproofs are an essential part of printing. You might say that proofs are the language of communication between customer and printer.
Proofs are the customers way of checking the job and correcting in time possible errors.

To save time it is sensible to check the correct items at the right time. The later in the work process you proofread the more expensive it will be to make corrections.
Below is a list of the proofs you may possibly receive for checking. All tenders assume error free jobs from the customer.

What to check and when