Science is a vast and intricate field, encompassing a wide range of disciplines that aim to understand the natural world and its phenomena. Here is a classification of the major branches of science, broadly categorized:

1. Natural Sciences:

* Biology: The study of life, including its origins, evolution, structure, function, and interactions.

* Zoology: The study of animals.

* Botany: The study of plants.

* Microbiology: The study of microorganisms.

* Ecology: The study of the interactions between organisms and their environment.

* Genetics: The study of heredity and variation.

* Chemistry: The study of matter and its properties, as well as how it changes.

* Organic Chemistry: The study of carbon-containing compounds.

* Inorganic Chemistry: The study of non-carbon-containing compounds.

* Analytical Chemistry: The study of the identification and quantification of chemical substances.

* Physical Chemistry: The study of the physical principles governing chemical reactions.

* Physics: The study of matter, energy, space, and time, and their interactions.

* Classical Mechanics: The study of motion and forces.

* Electromagnetism: The study of electricity and magnetism.

* Thermodynamics: The study of heat and its relation to energy.

* Quantum Mechanics: The study of the behavior of matter at the atomic and subatomic level.

* Astronomy: The study of celestial objects and phenomena.

* Astrophysics: The study of the physical properties of celestial objects.

* Cosmology: The study of the origin and evolution of the universe.

* Planetary Science: The study of planets and their moons.

* Earth Science: The study of the Earth's structure, composition, and processes.

* Geology: The study of the Earth's solid materials and their history.

* Meteorology: The study of the Earth's atmosphere.

* Oceanography: The study of the Earth's oceans.

* Climatology: The study of the Earth's climate.

2. Social Sciences:

* Psychology: The study of the mind, behavior, and mental processes.

* Sociology: The study of human society and its structure, interactions, and institutions.

* Anthropology: The study of human cultures, societies, and their origins.

* Economics: The study of how people make choices under scarcity.

* Political Science: The study of political systems, governments, and power.

* History: The study of past events and their significance.

* Geography: The study of the Earth's surface and its features.

* Linguistics: The study of languages and their structure.

3. Formal Sciences:

* Mathematics: The study of numbers, structures, and patterns.

* Logic: The study of reasoning and valid arguments.

* Computer Science: The study of computation and information processing.

* Statistics: The study of data collection, analysis, and interpretation.

4. Applied Sciences:

* Engineering: The application of scientific principles to design and build technologies.

* Medicine: The application of scientific principles to diagnose, treat, and prevent diseases.

* Agriculture: The application of scientific principles to produce food and fiber.

* Environmental Science: The application of scientific principles to understand and protect the environment.

This classification is not exhaustive, and many fields of study overlap and interrelate. For example, "biochemistry" combines biology and chemistry, while "astrobiology" explores the possibility of life beyond Earth.