What is function?

A function is a preset formula in Excel. Like formulas, functions begin with the equal sign ( = ) followed by the function’s name and its arguments. The function name tells Excel what calculation to perform. The arguments are contained inside round brackets.

When we input equal (=) sing in excel and press any letter, total number of functions will be displayed with a popup drop down. We can select our required function by navigating arrow key or by click. A little description will be also found the right side of the selected function just looks like below:

function indication

And when we select a function, the function syntax is also popup just below the function. So, I suggest you that never try to keep in mind about syntax or arguments. Only remember why we use this function.

function syntax

In the above function you see a ( ) bracket which hold its only one argument. Some function have more than one arguments. There are two types of arguments, mandatory and optional. Optional argument is rounded by [ ]. For an example, see the below function:



Excel Built-In Function Categories:

In excel we found 12 built-in categorized functions.

1. Text Functions
2. Logical Functions
3. Information Functions
4. Date and Time Functions
5. Lookup and Reference Functions
6. Math and Trig Functions
7. Statistical Functions
8. Database Functions
9. Financial Functions
10. Engineering Functions
11. Cube Functions
12. Web Functions

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