When you apply for a visa to visit United Kingdom or United States, authorities in Embassy will require you to submit Visitor Visa Invitation Letter from someone in that country. Please bear in mind that possession of a letter of  a visitor visa invitation letter does not guarantee that authorities will issue a visa, because visa invitation letter is only one of supporting documents for visa application among others. In Visa invitation letter your host is providing written declaration that he/she will sponsor your stay in the country so Visa officer can be assured that you will not cause any financial burden to the host country. In the text below you may find a sample of Invitation letter for a Visitor Visa to