Functions always operate on selected expressions.
Terms Used in the Formula Editor contains terms used for the parts of the formula itself.
A mathematical or logical operation that performs a specific action on one or more arguments. Functions include most items in the function browser list and all keypad operators. Functions always operate upon selected expressions, and arguments are always grouped with functions. To find which expressions serve as a function’s arguments, select that function in the formula. The boxed groupings also show how order-of-precedence rules apply and show which arguments are deleted when you delete a function.