When is it most appropriate to use a cover letter?

Using a cover letter is most appropriate when applying for a position of interest because it serves as a personalized introduction to your application. A cover letter allows you to highlight your qualifications, experiences, and motivations for applying to a specific role within an organization. It provides you with the opportunity to convey your interest in the position and to explain how your skills align with the company's needs. This personalized approach can set you apart from other candidates who may only submit a resume without additional context. It also enables you to demonstrate your understanding of the organization and to make a compelling case for why you would be a valuable addition to their team. In contrast, the other scenarios presented do not align with the primary purpose of a cover letter, which is to accompany job applications and express interest in specific employment opportunities.