I'll attempt to answer this. As worded your question makes no sense.
All functions are relations, but not all relations are functions.
Like all girls are people but not all people are girls.
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Not every relation is a function. But every function is a relation. Function is just a part of relation.
A function is a relation whose mapping is a bijection.
No. A relation is not a special type of function.
Good question. A relation is simply that; any x-value to create any y-value. A function, however, cannot be defined for multiple values of x. In other words, for a relation to be a function, it must have singular values for all x within its domain.
A relation has pairs of numbers. A function is a special relation where for each input there is one and only one output.