If we want to display the annotation point on any coordinates in MKMapView use the following functions-

By using the annotation anyone can easily recognize the location.We can also set the Title here which will show when user click on that annotation.

-(void)getPinOnMap{
    CLLocationCoordinate2D businessLocation;
//set value of latitude and longitude
    businessLocation.latitude = [latitude doubleValue];
    businessLocation.longitude= [longitude doubleValue];
     MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
    [annotation setCoordinate:businessLocation];
    [annotation setTitle:[NSString stringWithFormat:@"Location Title Here"]]; //You can set the subtitle too
    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(businessLocation, 0.5*OFFSET_ZOOM, 0.5*OFFSET_ZOOM);

    [self.mapView setRegion:viewRegion animated:YES];

    [self.mapView addAnnotation:annotation];

}

Here OFFSET_ZOOM is the constant and mapView is the property of MKMapView.