Do graduate schools care if letters are confidential or not? In general, graduate programs prefer confidential letters. Admissions officials say that it displays more confidence on the part of the applicant if letters are "confidential" (meaning you, the applicant cannot see the letter). The Letter Service is required to indicate on the letter if it is confidential or non-confidential.
Writing a letter of recommendation can be intimidating, especially because the person you’re writing it for is counting on you to pull through for them. Fortunately, there’s a general formula you can use to write a letter of recommendation that is both professional and effective.