A generic letter of recommendation can be used for different types of job applications or industries because it focuses on the employee's overall performance, character, and achievements rather than specific job requirements or industry standards. As long as the letter provides an accurate and positive assessment of the employee's qualifications and suitability for the job, it can be used as a general reference for various employment opportunities. When possible, ensure that the letter is customized to the particular job or industry to increase its relevance and impact.