A production function relates the output of a production process to the inputs used in the production process. It shows how much output can be produced from a given set of inputs. In other words, it expresses the relationship between the amount of goods and services produced (output) and the amount of resources such as labor, capital, and materials (inputs) used in the production process. The production function is an important concept in economics and is used to analyze the efficiency of production processes and to determine optimal input combinations for producing a given level of output.