jus curious

I was reading today on strings..
I came across a code with this line

Code:

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int countem( char ** ptr)

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ignore the function name

I want to know abt the parameter

I knew abt char *ptr where its a pointer but what does ** indicate ?/...can i know
any advice is appreciated thnx

Pointer to a pointer.

oh ..thnx but why do we need them?..i read it online but i can do with some help.thnx once agn

Just as if you would like to assign an integer variable in another function, perhaps you want to assign a pointer in another function, hence you would need a pointer to that pointer.