A letterhead is a heading at the top of a sheet of letter paper or stationery that includes a name, address, logo or trademark, and sometimes a background pattern. It is a professional document that outlines the name, logo, and contact details of an individual or organization and is found at the top of sheets and papers. A letterhead is typically used for printed letters but can also be used in digital messaging to maintain a branded feel. The purpose of a letterhead is to reach out to prospective clients and brand corporate communication. Letterheads are generally printed by either the offset or letterpress methods and are usually printed on A4 size paper in most countries outside North America, while in North America, the letter size is typically 8.5 x 11 inches. Although modern technology makes letterheads very easy to imitate, they continue to be used as evidence of authenticity.