Various types of paper and cardboard are identified based on different characteristics and purposes. Paper for writing is typically in standard A4 format and wide. The grammage of paper usually ranges from 60-300 g/m². Cardboard and heavy paper can be 300 g/m² and higher. There are special types of paper for specific purposes, such as coated, laminated, water-resistant, and tear-resistant papers available. Newspaper paper is usually thin and cheap, with a grammage of 40-52 g/m². Depending on the industry, paper is also divided into categories like printing paper, packaging paper, industrial paper, etc