Letter of thanks
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A letter of thanks or thank you letter is a letter that is used when one person/party wishes to express appreciation to another. A thank you letter should be written as a standard business letter or personal letter, and should not normally exceed one page. Personal thank you letters can be hand-written in cases in which the addressee is a friend, acquaintance or relative. Thank you letters are also sometimes referred to as letters of gratitude. These types of thank you letters are usually written as formal business letters.
There are numerous situations in day-to-day business that can warrant a thank you letter. Some typical situations include: appreciation for special consideration extended by another organization, thanking a speaker for a presentation at a board meeting, customer appreciation letters thanking customers for their patronage, thanks to employees for exceptional service or performance, thanks to an individual or organization for a customer referral, appreciation to volunteer service workers for their personal contributions to a public service campaign, etc....
As with business situations, there are many instances in day-to-day life that can warrant a formal thank you letter. Examples of typical personal thank you letter situations include: a follow-up thanks after a job interview or offer, thanks to a company or institution in appreciation for exceptional customer service received, letter to friends and/or neighbors for their support during a difficult period, letters for wedding gifts, thanks to a service club or agency for support given to family members, social occasion thank you letters for a wide variety of social situations,
Recent News Stories About Thank You Notes
Several major news sources have recently run articles highlighting the benefits of expressing thanks via the hand-written thank you note, Science calls the act of expressing gratitude a "Gratitude Intervention" and many counselors have examined the physical, emotional, and psychological benefits of expressing gratitude. 
- Guy Trebay April 4, 2014 New York Times
- Joann Lublin, February 5, 2008
- NPR Staff article, December 22, 2010
- R.A. Emmons, M.E. McCullough, 2003, Journal of Personality and Social Psychology Vol. 84, No. 2, 377–389
- M.L. Peters,Y.M.C. Meevissen, M.M. Hanssen, TERAPIA PSICOLÓGICA 2013, Vol. 31, Nº 1, 93-100