& - What does it ...

I am starting C++ and I have seen "&" this wery often. What does it do?

Depends on the context it's used in. Here's some examples:

Code:

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int i;
&i  //in this case it's accessing the pointer to your int i

if(1&0) //in this case it's a bitwise AND

if((1==1)&&(2==2)) //in this case it's a logical AND

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You can use & to make a reference to variable too:

int i = 3; // an int variable i
int& ref = i; // a reference to i
ref = 4; //now i has a value of 4