Cold cover letters can help secure unadvertised job positions. They differ from normal cover letters in that they are unexpected and not requested by recruiters. To write an effective cold cover letter, include an introduction highlighting your relevant skills and knowledge of the company, obtained from sources like business conferences or magazines. The body should demonstrate your experience and knowledge of the company. Maintain a positive attitude in the conclusion rather than using vague language. For best results, accompany the cold cover letter with an impressive resume tailored to the position.