Choosing the right tone for your letter is essential for conveying your attitude and emotion to your audience. Tone can impact how your audience perceives your credibility, professionalism, and sincerity, as well as how they respond to your message. Common tones for business letters include formal, informal, persuasive, and neutral. A formal tone is suitable for letters addressed to people with higher status or authority than you. It should use standard grammar, punctuation, and vocabulary, and show respect and courtesy. An informal tone is appropriate for letters addressed to people you know well or who have a similar or lower status than you. It should use casual grammar, punctuation, and vocabulary, allow slang or jargon, and show friendliness and familiarity. A persuasive tone is useful for letters that aim to convince or influence the audience to take a certain action or agree with your point of view. It should use logical arguments, emotional appeals, and credible evidence. Finally, a neutral tone is effective for letters that intend to inform or educate the audience without expressing any personal opinion or emotion. It should use factual and objective language and avoid bias or exaggeration. To choose the right tone for your letter, consider your purpose, audience, and relationship with them. For example, if you are writing a cover letter for a job application, you might want to use a formal and persuasive tone to show your qualifications.