## Python Functions (def): Definition with Examples.

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Python also accepts function recursion, which means a defined function can call itself. Recursion is a common mathematical and programming concept. It means that a function calls itself. This has the benefit of meaning that you can loop through data to reach a result.

A functionis a rulewhich relates the values of one variable quantity to the values of another variable quantity, and does so in such a way that the value of the second variable quantity is uniquely determined by(i.e. is a function of) the value of the first variable quantity. This is clearly a very general definition.

Vlookup (short for 'vertical' lookup) is a built-in Excel function that is designed to work with data that is organised into columns. For a specified value, the function finds (or 'looks up') the value in one column of data, and returns the corresponding value from another column. This best explained through the following example. Vlookup Example.

IT service management (ITSM) is a concept that enables an organization to maximize business value from the use of information technology. ITSM positions IT services as the key means of delivering and obtaining value, where an internal or external IT service provider works with business customers, at the same time taking responsibility for the associated costs and risks.

A hash function takes a group of characters (called a key) and maps it to a value of a certain length (called a hash value or hash). The hash value is representative of the original string of characters, but is normally smaller than the original.

The IF function checks whether a condition is met, and returns one value if true and another value if false. Explanation: if the score is greater than or equal to 60, the IF function returns Pass, else it returns Fail.