What does production possibilty frontier show?

The production possibility frontier (PPF) illustrates the maximum output combinations of two goods or services that an economy can achieve, given its resources and technology. It demonstrates trade-offs and opportunity costs, showing how increasing production of one good requires reducing the production of another. Points on the frontier represent efficient production levels, while points inside the curve indicate inefficiency, and points outside are unattainable with current resources. The shape of the PPF can also indicate the nature of opportunity costs, often being concave due to increasing marginal costs.