DDC

The Dewey Decimal Classification (DDC) is a widely used system for categorizing and organizing library materials. It was developed by Melvil Dewey in 1876 and has since been revised and expanded. The DDC system is based on a numerical notation, where each item is assigned a unique call number that reflects its subject matter. Here are some major categories of the Dewey Decimal Classification with examples:

**000 - General Knowledge:**

- 000 Generalities

  - 001 Knowledge

  - 003 Systems

  - 005 Computer programming

- 020 Library and information sciences

  - 025 Library operations

  - 027 General libraries

- 030 Encyclopedias and books of facts

  - 031 Encyclopedias in American English

  - 034 Encyclopedias in French

- 070 News media, journalism, and publishing

  - 071 Newspapers in North America

  - 079 Newspapers in other languages

**100 - Philosophy and Psychology:**

- 100 Philosophy

  - 150 Psychology

  - 160 Logic

- 170 Ethics

  - 171 Ethical systems

  - 179 Other ethical systems

- 180 Ancient, medieval, and Eastern philosophy

  - 181 Eastern philosophy

  - 189 Other philosophic traditions

**200 - Religion:**

- 200 Religion

  - 201 Religious mythology

  - 220 Bible

  - 230 Christian theology

  - 240 Christian moral and devotional theology

- 290 Other religions

  - 291 Comparative religion

  - 297 Islam and religions originating in it

**300 - Social Sciences:**

- 300 Social sciences

  - 301 Sociology and anthropology

  - 302 Social interaction

- 330 Economics

  - 331 Labor economics

  - 332 Financial economics

- 340 Law

  - 342 Constitutional and administrative law

  - 349 Other areas of law

- 360 Social problems and services; associations

  - 363 Other social problems and services

- 380 Commerce, communications, transportation

  - 381 Commerce

  - 387 Water, air, space transportation

**400 - Language:**

- 400 Language

  - 401 Philosophy and theory of language

  - 420 English and Old English languages

  - 430 German and related languages

- 490 Other languages

  - 491 East Indo-European and Celtic languages

  - 499 Austronesian and other languages

**500 - Natural Sciences and Mathematics:**

- 500 Natural sciences and mathematics

  - 501 Philosophy and theory

  - 510 Mathematics

  - 520 Astronomy

  - 530 Physics

  - 540 Chemistry

- 590 Animals (Zoology)

  - 591 Specific topics in natural history

  - 599 Mammals

**600 - Technology:**

- 600 Technology (Applied sciences)

  - 610 Medicine and health

  - 620 Engineering

  - 630 Agriculture and related technologies

  - 640 Home and family management

- 650 Management and auxiliary services

  - 651 Office services

  - 657 Accounting

- 690 Buildings

  - 691 Building materials

  - 699 Building construction

**700 - Arts and Recreation:**

- 700 Arts

  - 701 Philosophy and theory

  - 720 Architecture

  - 730 Sculpture, ceramics, and metalwork

- 780 Music

  - 781 General principles and musical forms

  - 790 Sports, games, and entertainment

  - 792 Stage presentations

**800 - Literature:**

- 800 Literature

  - 801 Philosophy and theory

  - 810 American literature

  - 820 English and Old English literatures

  - 830 German and related literatures

**900 - History and Geography:**

- 900 History

  - 901 Philosophy and theory

  - 910 Geography and travel

  - 920 Biography and genealogy

  - 930 History of ancient world (to ca. 499)

  - 940 History of Europe

  - 950 History of Asia

  - 960 History of Africa

These are just a few examples from the Dewey Decimal Classification system. Each category can be further divided into subcategories, allowing for a detailed classification of library materials based on their subject matter. It's a widely used system in libraries, making it easier for users to locate specific materials based on their interests and research needs.