What is the fundamental difference between a relation and a function? Is every relation a function?


The difference between a relation and a function is that a relationship can have many outputs for a single input, but a function has a single input for a single output. This is the basic factor to differentiate between relation and function.
Not all relations are functions, however, every function is a relation. A function is a relationship in which there is only one output for each input.

Final Answer:
The difference between a relation and a function is that a relationship can have many outputs for a single input, but a function has a single input for a single output. This is the basic factor to differentiate between relation and function.
Not all relations are functions, however, every function is a relation. A function is a relationship in which there is only one output for each input.