Justice is what people cry out for when they have been wronged. It is the oldest political demand and the most contested — not because anyone opposes it, but because everyone defines it differently.
Distributive justice asks how goods should be shared. Retributive justice asks how wrongs should be punished. Restorative justice asks how broken relationships should be healed. Procedural justice asks whether the process itself is fair, regardless of outcome. Every society emphasizes a different mix.
Plato devoted his longest work to the question. Rawls asked what rules you would choose from behind a veil of ignorance, not knowing your own position. The Ubuntu tradition holds that justice is inseparable from community — a person is a person through other people.
The deepest tension within justice is that perfect fairness and perfect mercy cannot coexist. Every legal system, every parent, every leader navigates this daily. That navigation — not any formula — is what justice actually looks like in practice.