implicit vs. explicit function in powerpivot

[stephme55]

What's the difference between explicit vs. implicit function in powerpivot?

[ranman256]

implicit is a variable with no definition

sub mysub()
x = date()     'now x is a date
x = 43    'now x is a number

Explicit is defined explicitly

sub mysub()
dim x as Date
x = date()   'works
x = 5.4     'error since x must be date

[stephme55]

Hmm, I get it, but I don't get it in the context of powerpivot.