A letter of recommendation or reference letter, referred to as a letter of recommendation, executive letter of recommendation, professional letter of recommendation and urban legend letter of recommendation, is a written document where the author states his or her personal opinion about the candidate, where he or she provides a detailed profile of the candidate and why he or she should be selected for the position. Common reasons for candidates request such a letter are to be noticed by higher-ups, to be put on their good side, to create a good impression or to simply say thank you to the person who has referred the candidate. There are different types of recommendations for different jobs. An executive recommendation refers to a that is generally recommended by higher-ups within an organization. A letter of recommendation can also come from a non-employee.