Copy editing and proofreading share certain similarities with each other because they are both parts of mechanical editing. There are noticeable variances between them even though they share several procedures, such as fixing typos and poor grammar.
The goal of copy editing is to maintain the information understandable to the readership it is meant for while ensuring that sentences flow logically from one to the next. The gatekeepers who preserve a publication's tone and style guidelines are also copy editors. They ensure coherence both inside a single piece and among all works included in the publication.