If I click on the VPN link above it takes me to the vendor's site and at the top of the page, my IP address is displayed. Sites can track you using your IP address.
This is displayed without a VPN(it displays me full IPAddress and my service provider):
View attachment 272424
When I sign onto that website using VPN it shows this (not my IP address and not my service provider):
View attachment 272425
This makes me anonymous online and will prevent a lot of spam, unwanted advertising, and tracking.
I use Private Internet Access, it's inexpensive and doesn't slow things down too much.