A professional proofreader is someone who checks and corrects written documents, making sure they are free of errors such as spelling mistakes and grammar issues. Full definition
If possible, enlist a friend or a family member to help proofread your cover letter, as two pairs of eyes are better than one and even professional proofreaders don't always catch their own mistakes. (thebalance.com)
In addition, exceptional research team can address all your requests and answer to almost every writing subject, while professional proofreaders will check all papers before delivery. (top-writers-reviews.com)