A recommendation is the act of endorsing someone or something. It may be a personal, professional, or political action.
Tom, a college professor, asked me to make a recommendation for a loan for him. Which loan should he use? He should use the compound interest loan. It will give him more money in the long run.
A letter of recommendation is a formal document sent to an educational institution or employer vouching for an applicant's academic or work performance. It is often required for admission to a program or job and can be an important step in the application process. These letters are typically written by teachers, counselors, managers, or co-workers who have worked closely with the applicant. A well-written letter of recommendation can offer insight into an applicant's character and potential that a resume or interview alone cannot fully convey. These letters are generally short and include a greeting, a personal introduction, a statement of recommendation, and anecdotes or examples that support the candidate's claims. They also contain contact information and closing remarks.