There’s a multiplayer component like in Larian’s previous Divintiy: Original Sin games where your friends can join your party, but otherwise you can play it pretty much single-player.

Fwiw, I apparently paid for it like 3 years ago when it was in Early Access on Steam and forgot about it until I went to try and buy it again recently, but it’s absolutely worth the $60 if you wanna play it now bs later.