What is this asterisk for?

Question

I'm learning c programming, and I don't understand what is this asterisk for in the main method.

int main(int argc, char* argv[])

Answer 1

char* a; means that a is a pointer to variable of type char.

In your case argv is a pointer to a pointer (or even several of them - it is specified in argv in your case) to a variable(s) of type char. In other words, it's a pointer to an array (of length argv) of pointers to char variables.

You can even write your code this way: int main(int argc, char** argv) and nothing, actually, changes as soon as char* a is the same as char a[].