The content of the invitation letter should contain why you would like a specific person to visit your country, how long he or she's going to stay, and what possible future liaison can be drawn up between yourself, and the person who you're inviting over. So long as the letter includes all the essential info, you or the man inviting you are not going to have trouble writing it. Also, you must learn whether the letter is formal or informal and pick the right tone. Therefore, it's required to comprehend how to compose a formal letter effectively. Such letters increase the trustworthiness of the person endorsed.