What is Philosophy? Meaning, Branches & Definition

Key Takeaways

Philosophy means “love of wisdom” — a term first used by Pythagoras around 600 BCE.
Pure philosophy has four branches: Logic, Epistemology, Metaphysics, and Ethics.
Applied philosophy extends into religion, science, mind, language, politics, and applied ethics.
General questions in philosophy are abstract — not tied to any specific object or event.
Fundamental questions are ultimate questions — ones that cannot be reduced further.
Doing philosophy — engaging with its questions directly — is the best way to understand it.

Introduction

Philosophy is one of the oldest and broadest intellectual disciplines, asking questions about existence, knowledge, value, reason, mind, and language. This introductory note explores what philosophy is by examining four complementary approaches: the meaning of the word itself, the branches it covers, a formal definition, and the practice of doing philosophy. Together, these four approaches give undergraduate students a clear and comprehensive entry point into this vast subject.

Table of Contents

1. The Meaning of the Word ‘Philosophy’

Understanding the origin of the word ‘philosophy’ is the first step toward grasping what the discipline involves.

Greek Origins

Philosophy comes from the ancient Greek word philosophia.
Philo means love; sophia (or sophos) means wisdom.
Philosophia therefore means the love of wisdom.
The word travelled from Greek into Latin, then into Old French as philosophie, and finally into English as ‘philosophy’ — the meaning remaining constant throughout.

Pythagoras and the Philosopher

Pythagoras (c. 570–495 BCE), the Greek mathematician and thinker, is credited with first using the word ‘philosopher’.
When asked by King Leon ‘Who are you?’, Pythagoras replied, ‘I am a philosopher.’
Pythagoras compared life to a festival with games — an analogy that captures the philosopher’s unique role.

Analogy: Some people compete in the games for prizes, fame, or money. Others attend only to sell goods for profit. But a philosopher is like a spectator — observing and trying to understand the game itself, seeking truth rather than reward.

The goal of philosophy is not to accumulate information, but to develop understanding, mental clarity, and wisdom.

2. The Branches of Philosophy

A second way to understand philosophy is by looking at its fields of study. Philosophy divides into two major categories: pure philosophy and applied philosophy.

Pure Philosophy

Pure philosophy deals with the most fundamental and abstract questions. It has four core branches.

Logic — the study of reasoning. It examines the principles that distinguish valid arguments from invalid ones.

Example: Valid argument — All humans are mortal. Socrates is a human. Therefore, Socrates is mortal. Each premise supports the conclusion, so the argument is valid.

Example: Invalid argument — All singers are famous. Sachin Tendulkar is famous. Therefore, Sachin Tendulkar is a singer. Both premises are true, yet the conclusion does not follow — this is an invalid argument.

Epistemology — the theory of knowledge. It asks: What is knowledge? What can I know? How can I know it? Is there knowledge beyond experience?
Metaphysics — the theory of being and reality. It asks: What exists? Is the physical world all there is? Does God exist? Do abstract objects like numbers really exist?
Ethics — the theory of value. It asks: What is good and bad? What is right and wrong? What makes an action moral or immoral? Does morality depend on religion?
Aesthetics — the study of beauty and art. Some scholars treat it as part of ethics; others consider it a separate branch. It asks: What is beauty, and why should we pursue it?

Applied Philosophy

Applied philosophy takes the methods and questions of pure philosophy and applies them to specific domains. Its branches are not fixed, but the most widely recognised include the following.

Philosophy of Religion — studies the concept of God, the existence of the divine, and the philosophical basis of religious belief.
Philosophy of Science — examines the validity of scientific methods and the nature of scientific knowledge; connected to both epistemology and metaphysics.
Philosophy of Mind — asks: What is the mind? How is the mind related to the body? Connected closely to metaphysics.
Philosophy of Language — studies meaning, the relationship between language and reality, the limits of language, and how language relates to thought.
Political Philosophy — one of the oldest applied branches; examines justice, power, rights, and the ideal structure of society. Plato’s Republic is a foundational text.
Applied Ethics — applies ethical principles to specific real-world issues such as abortion, capital punishment, business ethics, bioethics, environmental ethics, and legal ethics.
Other branches include philosophy of logic, philosophy of mathematics, philosophy of history, philosophy of biology, and philosophy of social science — the list continues to expand.

Note: The highest academic degree in any field is a PhD — Doctor of Philosophy. This reflects how foundational philosophical inquiry is to all areas of human knowledge.

3. The Definition of Philosophy

A third approach is to examine a formal definition. A widely accepted definition states: Philosophy is the systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. Each term in this definition carries precise philosophical meaning.

Systematic Study

Systematic means the study is organised, logical, methodological, and documented.
Philosophy does not rely on guesswork or casual opinion — it follows structured methods of analysis and argumentation.

General Questions — What Does ‘General’ Mean?

In philosophy, ‘general’ means abstract — not tied to any specific or concrete object.

Concrete questions refer to specific objects or events.

Example: ‘What is that noise?’ — This is concrete because it refers to one particular noise.

General questions move away from the specific toward the abstract.

Example: ‘What is noise?’ — Less specific; it refers to noise in general, not any one instance.

Example: ‘Why do events happen?’ — This is now fully abstract and philosophical; it applies to all events, not just one.

A second illustration: ‘What is the meaning of this sentence?’ is concrete. ‘What is the meaning of a sentence?’ is general. ‘What is meaning?’ is fully philosophical — detached from any specific object.
Philosophy asks questions that are not anchored to any particular thing in the world.

Fundamental Questions — What Does ‘Fundamental’ Mean?

In philosophy, ‘fundamental’ means ultimate — the deepest level of questioning where no further ‘why’ is possible.

Every ordinary question can be followed by another ‘why?’ — this creates an infinite chain.

Example: Why did he fall? Because he was drunk. Why was he drunk? Because he was unhappy. Why was he unhappy? Because he was divorced — and so on. Each answer invites a new question.

Fundamental questions are the end of this chain — they ask about first causes or ultimate origins.

Example: ‘What is the first cause of everything?’ — This is a fundamental philosophical question.

Philosophical questions are not approximate or temporary; they aim at the deepest and most final level of understanding.

Topics Covered by the Definition

Existence → Metaphysics
Reason → Logic
Knowledge → Epistemology
Value → Ethics
Mind → Philosophy of Mind
Language → Philosophy of Language

4. Doing Philosophy

The fourth and most effective way to understand philosophy is simply to do it — to engage directly with its questions and problems.

Philosophy as a Living Discipline

Philosophy is not a static or fixed body of information to be memorised.
It is a dynamic, living subject — constantly evolving, like a flowing river.
New debates, new arguments, and new perspectives emerge continuously.
The best way to understand philosophy is to engage with its problems first-hand.
When you discuss philosophical problems, examine arguments, and try to resolve them, you naturally develop an understanding of what philosophy is and how it works.

Conclusion

Philosophy — derived from the Greek for ‘love of wisdom’ — is a systematic, rigorous discipline that asks the most general and fundamental questions about existence, knowledge, value, reason, mind, and language. Its branches range from pure philosophy (Logic, Epistemology, Metaphysics, Ethics) to a wide array of applied fields. Understanding philosophy through its etymology, its branches, its formal definition, and above all through active engagement, provides the clearest picture of what this remarkable discipline offers. As a student, the most rewarding step you can take is to begin thinking philosophically — and you have already started.

Frequently Asked Questions

What is the meaning of the word ‘philosophy’?

The word philosophy comes from the ancient Greek word philosophia, which combines philo (love) and sophia (wisdom). It therefore means ‘love of wisdom.’ The term is believed to have been first used by the Greek thinker Pythagoras around 2,600 years ago.

What are the main branches of philosophy?

Philosophy is divided into pure philosophy and applied philosophy. Pure philosophy has four core branches: Logic (the study of reasoning), Epistemology (the theory of knowledge), Metaphysics (the theory of reality and existence), and Ethics (the theory of value). Applied philosophy includes fields such as philosophy of religion, philosophy of science, philosophy of mind, philosophy of language, political philosophy, and applied ethics.

What is the difference between a general question and a concrete question in philosophy?

A concrete question refers to a specific object or event — for example, ‘What is the meaning of this sentence?’ A general (or abstract) question is not tied to any specific object — for example, ‘What is meaning?’ Philosophy deals with general and abstract questions, not with specific instances.

What does ‘systematic study’ mean in the definition of philosophy?

Systematic study means that philosophy is conducted in an organised, logical, and methodical manner. Philosophers use structured methods of analysis and argumentation, document their reasoning, and build on previous work. It is not simply an expression of personal opinion.

What are fundamental questions in philosophy?

Fundamental (or ultimate) questions are the deepest level of questioning — ones that cannot be reduced any further by asking ‘why?’ again. For example, tracing a chain of causes leads eventually to the question ‘What is the first cause of everything?’ — a fundamental philosophical question. These are the questions philosophy is most concerned with.

Why is ‘doing philosophy’ considered the best way to understand it?

Philosophy is a dynamic and living discipline, not a fixed set of facts to memorise. Engaging directly with philosophical problems — discussing arguments, analysing positions, and attempting to solve questions — naturally develops your understanding of what philosophy is and how it operates. Passive reading alone cannot fully capture this.