This document is a student paper analyzing the concept, nature, and importance of information. It was written by Diana Carolina Mendez Banda for teacher Heriberto Flores Reyes at the Autonomous University of Puebla's Faculty of Chemical in September 2014. The paper defines primary sources as original publications like scientific journals and books. Secondary sources contain analysis and descriptions of primary sources to make the information more accessible. Tertiary sources collect and organize secondary sources and some primary sources, such as bibliographies and thesauruses. The document also categorizes information sources based on their nature, structure, and media.