fender white strat

on my fender squier strat what is the thing u screw in, it’s long, metal & white and i think it makes effects?
how does it work?
its called the ‘whammy’ bar. its used to make your notes bend by loosening the strings. pantera used it a lot along with many other blues bands. its a fun tool to use but its hard to get accustomed to it.
Fender Strat / Clean / Blues Tone