Recommendation letters are written for free by people who have experience working with a job candidate. The letter is used as a tool to help prospective employers judge the skills and qualifications of a job candidate and also to determine if the candidate is a good fit for the company.
The most effective recommendation letters are written with the potential job in mind. General recommendation letters are useful when explaining the quality of work and enthusiasm a candidate has contributed to previous positions. Reference letters should contain information that explains how the candidate and the reference are acquainted and for how long.