What is a person?

The big idea: Say the word 'person' and you probably picture a human being. But in philosophy those are two different words — and pulling them apart is where this whole topic starts.

'Human being' is a biological label — it's about your species. 'Person' is about status — being the kind of thing that can think, choose, and be treated as having rights. Usually the two go together. The interesting philosophy is where they might come apart.

Hold onto this: 'Human being' is about your species. 'Person' is about your status — the kind of thing that thinks, chooses and can be owed respect. Keep them apart and the rest of the topic opens up.

If being human isn't what makes you a person, what does? One clear answer comes from an American philosopher.

Mary Anne Warren's five marks: Mary Anne Warren argued that a person is any being that has these traits — not a particular species:

1. Consciousness — it can feel things (pleasure, pain). 2. Reasoning — it can solve new problems, not just react. 3. Self-awareness — it can think of itself as a 'me'. 4. Communication — it can share thoughts in some language. 5. Moral agency — it can weigh right and wrong and act on it.

Meet most of these and you count as a person — whatever you're made of.

Checkpoint — Warren: In one line: a person is whatever has the right mental abilities — consciousness, reasoning, self-awareness, communication, moral agency — not whatever has human DNA.

This isn't word-games — the gap between 'human' and 'person' decides real moral questions.

Go further — higher-level insight: Notice the risk in Warren's checklist: set the bar too high (needs full reasoning and language) and you seem to exclude babies and people with severe cognitive disabilities. Warren answers that we still owe them protection for other reasons. Naming that worry — and her reply — is a top-band move.