Excel IF formula

In Excel 2010, I am viewing a spreadsheet that contains an IF statement (below are the details)

Cell B4 contains Sales 2013
Cell B5 contains Sales 2014

In Cell B6 the formula contains =IF(B5="","",(B4-B5)B5)

I am not familiar with part of the formula that indicates:  B5="","",

Any feedback is greatly appreciated, Thanks.
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fjkaykr11Asked:
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Rodney EndrigaData AnalystCommented:
The first portion of the formula is validating the contents of the cell reference. In this example, the cell reference is B5.
It is checking to see if the cell is BLANK (no data/text in the cell).

The second portion of formula is applying a results to the cell where the formula resides (in this case, cell B6). In this example, the result would be BLANK ("") if cell B5 is BLANK.

The basic IF formula structure is:
     if(logical test, [value if true], [value if false])
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fjkaykr11Author Commented:
Rodney, thank you for the detailed explanation. I really appreciate your help!
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Rodney EndrigaData AnalystCommented:
No problem, fjkaykr11, glad I can help.
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