A worksheet function is represented by a keyword in an Excel formula that performs some action on input and returns output to the calling procedure, either a worksheet cell or another function.
A worksheet function is represented by a keyword in an excel-formula that performs some action on input and returns output to the calling procedure, either a worksheet cell or another function.
Worksheet functions may be used in vba as well, returning output to a VBA function.
The worksheet-function tag should be distinguished from the excel-formula tag. If your question is about specific functions and what they do, use the worksheet-function tag. If you are asking about a formula you've written that doesn't return the result you expect, use the excel-formula tag.