A6 size refers to a paper dimension that measures 105 mm by 148 mm, or approximately 4.1 inches by 5.8 inches. It is part of the A series of paper sizes defined by the ISO 216 standard, which is widely used in many countries around the world. A6 is commonly used for postcards, invitations, and small flyers. This size is half of A5 and a quarter of A4, making it a convenient option for various printing and stationery needs. Its compact dimensions allow for easy handling and storage, making it popular for personal and professional use alike.