There are two main methods of cataloging books: the Dewey Decimal System and the Library of Congress Classification system.
The Dewey Decimal System was created by Melvil Dewey in 1876 and is the most widely used system in public and school libraries. It arranges books by subject and assigns each book a number (000-999) based on its topic. For example, books about history would be given a number in the 900s, while books about science would be given a number in the 500s.
The Library of Congress Classification system was created by the Library of Congress in 1897 and is used mainly in academic libraries. It arranges books by subject and assigns each book a letter (A-Z) and a number (1-999) based on its topic. For example, books about history would be given a number in the Ds, while books about science would be given a number in the Qs.
Both systems have their pros and cons, but both are widely used and accepted.
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