Why is for(;;) used?

Question

I have seen code (in C) which contains something similar to:

for(;;){
}

How would this work, and why is it used in any instance?

Answer 1

It is the idiomatic way to have an infinite loop.

In the C Programming Language book, by Kernighan & Ritchie book it was introduced in section 3.5:

for (;;) {
    ...
 }

is an infinite loop, presumably to be broken by other means, such as a break or return.

Answer 2

is an infinite loop something like

while(true) 
{}