Installing on android tablet

I currently use 'Norton Security Deluxe 5 Devices' on 1 device only so far, my Samsung Windows 7 Laptop. I am looking to purchase an Huawei T3 10 tablet that runs on Android 7.0 Nougat. I note that the System Requirements for my Norton product indicate it can be used with 'Android 4.0 or later with Google Play app installed'.

As someone with no prior experience of Google Play I am trying to find out just what Norton's requirement here is - I rather had the impression that Google Play was a library of Apps rather than an App in it's own right (?) - in which case just what app  does Norton require? More importantly perhaps, is any additional expense likely to be involved? I believe the Huawei comes with Google Play (the 'library') installed, but presumably any apps needed come at a cost?

So just what is involved in setting up the Huawei as my second device?

Peter