A4 paper is a standard paper size commonly used for printing and writing. It measures 210 millimeters in width and 297 millimeters in height, which is approximately 8.27 inches by 11.69 inches. A4 is part of the ISO 216 standard, which defines various paper sizes used internationally. This paper size is widely utilized in offices, schools, and homes for documents, letters, and reports. A4 paper is compatible with most printers and copiers, making it a popular choice for everyday tasks. It is often available in different weights and finishes, such as glossy or matte, to suit various needs.