Explanation:

Production function is an expression of the technological relation between physical inputs and output of a good.
Symbolically: Ox = f i1, i2, i3…. in)
{Where: Ox = Output of commodity x; f = Functional relationship; i1, i2, …. in = Inputs needed for Ox}
Example of Production function:
Suppose a firm is manufacturing chairs with the help of two inputs, say labour (L) and capital (K). Then, production function can be written as: OChairs = f (L, K)
Production function defines the maximum chairs (OChairs ), which can be produced with the given capital and labour inputs. If production functions is expressed as: 250 = (7L, 2K). It means, 7 units of labour and 2 units of capital can produce maximum of 250 chairs.