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Functions assign outputs to inputs. The domain of a function is the set of all possible inputs for the function. For example, the domain of f(x)=xÂ² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0. We can also define special functions whose domains are more limited.
Summary: The domain of a function is all the possible input values for which the function is defined, and the range is all possible output values. If you are still confused about domain and range, you might consider posting your question on our message board, or reading another website's lesson on domain and range.hat kind of functions don't have a domain of all real numbers? Well, if the domain is the set of all real numbers for which the function is defined, then logically we're looking for a function that has certain input values that do not produce a valid output, i.e., the function is undefined for that input.