What philosophy is and what it asks
Philosophy is the disciplined habit of asking what our ordinary words and beliefs really commit us to, and whether those commitments hold up.
A working definition
Philosophy studies the most general questions people can ask: what exists, what we can know, how we ought to live, and what makes reasoning good. Unlike a lab science, it rarely settles questions with an experiment. Its main tool is careful argument: stating a position clearly, testing it against objections and cases, and revising it when it breaks.
The main branches
Metaphysics asks what reality is made of and how things persist and change. Epistemology asks what knowledge is and how beliefs are justified. Ethics and value theory ask what is good, right, and worth pursuing. Logic studies what follows from what. Many other fields, such as philosophy of mind, science, politics, and art, apply these core questions to a particular subject.
Worked example: one question, four branches
Take the question 'Should I trust what my phone's news feed shows me?' A metaphysician asks what a 'fact' is. An epistemologist asks what would justify trusting a source. An ethicist asks whether the platform owes users honest selection. A logician checks whether the claim 'everyone is sharing it, so it must be true' is a good inference. Philosophy is the practice of noticing that one everyday worry contains all of these.
Flashcard
The study of what exists and what it is like
Check your understanding
A student asks, 'Can I ever be certain that the world outside my mind is real?' Which branch of philosophy is this question mainly about?