How to disable URL sharing
It's called Handoff &amp; is part of Continuity, enabling seamless working between all your devices.

As far as its underlying structure, Continuity uses Bluetooth, WiFi &amp; internet connectivity, all linked via your iCloud account.
Handoff itself requires Bluetooth, so works at short distance only.


  Turn Handoff on or off
  
  Note: If you don’t see a Handoff option on your device, it doesn’t
  work with Handoff.
  
  
  On your Mac: Choose Apple menu  > System Preferences, click General, then select “Allow Handoff between this Mac and your iCloud devices”
  (below “Recent items”). To turn it off, deselect the option.
  On iPad, iPhone or iPod touch: Go to Settings > General > Handoff, then tap to turn on Handoff. To turn it off, tap the option.
  On Apple Watch: Open the Watch app on iPhone, go to My Watch > General, then tap to turn on Enable Handoff. To turn it off, tap the
  option.