Answered by Stephanie, Hiring Expert at AT&T Inc., on Tuesday, May 23, 2017
That is a great question! There are many different jobs that ask for a writing sample, even if writing may not be a key component of the job. What does the employer want to know about you? They want to know if you can organize your thoughts into a cohesive narrative, do you use appropriate vocabulary and grammar in your written communications, are you able to draft a structured message for a reader.
Prior to providing this sample, the employer won't have had much opportunity to check out your skills in this area. Resumes tend to be fairly short form, applications don't leave a lot of room for going into rich detail, so consider this an opportunity to express yourself professionally and thoroughly.
Get in there and show them what you've got! Best of luck!