Objective-c mapKit?

Question

Objective-C

Good day, I started to learn mapKit, I looked at a couple of lessons, there was nothing unusual, they added a label, wrote a normal piece of code, added buttons, implemented protocols, etc., in
general, nothing unusual. But then I came across 1 lesson, the guy just added a button on bar and in the method of this button I wrote the following code:

-(IBAction)actionDirection:(id)sender {
    NSString * urlString = @"http://maps.apple.com/maps?daddr=40.707184,-73.998392";
    ;
}

installed the outlet, of course, and so, after clicking, I get a LOT of different functionality (and labels, and map mode, and more).
Question: what does this code do? how did we get all this?
PS sorry for my literacy

Answer 1

Learn to read documentation. The code opens the standard application "Maps"