A4 paper : paper size that measures 210mm by 297mm or approximately 8.27 inches by 11.69 inches. The weight of the paper is typically measured in grams per square meter (gsm). 80gsm is a standard weight for A4 paper and is commonly used for everyday printing, copying, and writing. It is a lightweight paper that is easy to handle and is suitable for most printing needs. It is important to note that paper weight can vary depending on the brand and type of paper. Other common weights for A4 paper include 70gsm, 90gsm, and 100gsm.