A classification system is a method used to organize and categorize items, concepts, or information based on shared characteristics. This system helps in identifying, sorting, and retrieving data efficiently. For example, in biology, the Linnaean taxonomy classifies living organisms into groups such as kingdoms, phylum, class, order, family, genus, and species. Classification systems are also prevalent in libraries, where books are organized using systems like the Dewey Decimal System. This allows users to find materials easily by grouping them according to subject matter. Overall, classification systems enhance understanding and accessibility across various fields.