Dear [Hiring Manager Name], I am applying for the [Job Title] position at [Company Name] as I move from [Previous Field] into [New Field]. I am making this change because [a clear reason related to the work]. In my previous role, I developed [transferable skill] through [specific responsibility or project]. For example, I [your contribution] and achieved [a supported result]. That experience relates to your need for [a requirement from the vacancy]. To prepare for the transition, I have [relevant training, project or experience]. It has helped me build [new capability] and understand [a practical aspect of the target role]. I would bring both that preparation and my experience in [transferable area]. My resume is [attached or available on request], and I would welcome a discussion about how I could contribute to your team. Sincerely, [Your Name]