A_4 (Pitch) is a standard paper size commonly used in many countries around the world. It measures 210 mm by 297 mm, or approximately 8.3 inches by 11.7 inches. This size is part of the A series defined by the ISO 216 standard, which is widely adopted for various printing and writing purposes. The A_4 size is often used for documents, letters, and reports due to its convenient dimensions. It is also the most common size for office printers and copiers, making it a practical choice for everyday tasks in both professional and educational settings.