Hybrid functions f(x) are made piece by piece, as the function is defined within sub-domains.
Composite functions can be thought of as chained functions or computation machines, where the output of one function becomes the input of another functions.
Inverse functions can reverse the computation of the original function f(x). If the function f(x) is one:one, that is one x-value corresponds to one y-value and vice versa, then the inverse function exists.