Is every relation also a function? Explain. No. A relation is a special type of function where each input maps to exactly one output. In a function, an input can have one or more outputs. Yes. A function is a special type of relation where each input maps to exactly one output. In a relation, an input can have one or more outputs. Yes. A relation is a special type of function where each input maps to exactly one output. In a function, an input can have one or more outputs. No. A function is a special type of relation where each input maps to exactly one output. In a relation, an input can have one or more outputs.