The following statements explain the difference between relation and function,
1. Function has a special with output and input.
Relation is a mapping of input and out put.
2. In a function all inputs have only one output.
In a relation a input can have as many outputs as it wants as long as all inputs have outputs.
3. In difference between relation and function, the relation is somewhat like a entire function problem and with input and output.
4. In difference between relation and function, the function is merely a particular relation with accurately one output for every input.