Is Closure a Function?

Programming, we use the body to implement the mapping because it's more efficient in terms of memory. It seems like on the one hand, it sort of feels right, but also doesn't feel right because it also feels like functions are special. I can tell you that enclosure, we asked the opposite question. So enclosure hash maps can behave as functions. Oh, interesting. Closure is a lease, right? So the first element in the parenthesis is expected to be an operator, it's a macro or a function. Or a special form, right?