What is the use of UPPER function?

UPPER Function in Excel Converts all lowercase letters in a text string or cell reference to uppercase.
Any characters that are not text will not altered.

What is the syntax of UPPER function?

UPPER Function in Excel Syntax
Upper(text)
Where text : The text string you want to change to upper case.

UPPER Function in Excel – Examples

UPPER Function in Excel Examples

Reference:

Please refer the below article for more Text Excel functions.
Text Excel Formulas

Please refer the below article for more Excel Functions.
Excel Formulas | Home