The mathematical concept of a function expresses the intuitive idea that one quantity (the argument of the function, also known as the input) completely determines another quantity (the value, or the output).
A function assigns a unique value to each input of a specified type.
Functions can be classified according to the properties they have. These properties describe the functions behaviour under certain conditions.
There are different types of functions.
Aggregate functions, datatype conversion functions , date functions, Mathematical functions, security functions, string functions, system functions, text and image functions.
Continuous function simply means that function is continuous without any abrupt or sudden change in the value of function. A function is continuous in its domain D if it is continuous at every point of its domain. Continuous functions are precisely those groups of functions that preserve limits.
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