"Letter-sized" refers to a standard paper size commonly used in the United States and Canada. It measures 8.5 inches by 11 inches (21.6 cm by 27.9 cm) and is often used for printing documents, letters, and forms. This size is widely recognized in both personal and professional settings. In contrast to other paper sizes, such as A4, which is used in many other countries, letter-sized paper is specifically designed for North American printing needs. It is the most popular size for office supplies, making it essential for tasks like printing resumes, reports, and school assignments.