In a job interview what you are supposed to do is demonstrate that you are capable and qualified and also prove that you are the right person for the job. Nothing is as strong and convincing as getting a recommendation from a second party. An approval letter can turn out to be determinate factor in ensuring you get that job you have always desired.
To avoid getting a recommendation that is similar to everyone else, you need to start preparing for one early enough. Also, rather than going for the people in high authority in your company, get your immediate manager to draft for you the letter of recommendation since they know you much better and will not get a template recommendation that everyone usually gets.
Employers look for those elements in your commendation letter that confirm that the person who drafted the letter has actually worked with you. Therefore, get the manager that is familiar with your work to recommend you. This will also increase the credibility and trustworthiness of the letter.
A letter of approval needs to be well drafted, hence give the person drafting the letter as much information about the requirements of the new job. This will help the writer to find the right words to use to connect the letter to your new employment.
Avoid getting a generalized recommendation letter since it is never effective. It would be better for the letter to be more specific to your abilities as per the new job requirement and in addition mention your contribution in your former employment