The Send link to your devices and Send page to your devices feature in Microsoft Edge allows you to send a link or tab to your other devices you have turned on sync for your profile in Microsoft Edge.
When you send a link or page to a synced device, the device you sent the link or page to will show a notification from Microsoft Edge with the link or page. If you click/tap on the notification, it will open the link or page in Microsoft Edge.
This tutorial will show you how to send a link or page to share with your synced devices in Microsoft Edge.