Help replacing this code "/site.webmanifest"

Hello, I added a custom apple touch icon to my site and there is this line of css in there.

 <link rel="manifest" href="/site.webmanifest">

Can someone explain what "/site.webmanifest" is or what it is that I need to replace this with. Thank you in advance!

5 hours ago, paul2009 said:

@irmusikgroup See Adding a site icon on iOS devices.

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Thank you for your response. This helped clear things up a bit.